Custom Exhaust

[USAFPILOT]

I would personally like to see pics of some custom exhaust setups, rather than the aftermarket mass produced stuff out there. I'm not sure I want any of them. I like the look of the stock rectangular exhaust on my 94 and don't want to give up the look, but I want the increased flow and sound some of the other systems give.

I plan on spending the bulk of my exhaust budget on some headers built by Corey H, and want the catback to include highflow cats some sort of resonator or x-pipe and a livable set of mufflers. Some drone I don't mind, it is all about the HP and ability to accommodate future big cube upgrades.

I'd like to spend 2K tops. If I bought stainless works xpipe and the B&B I would be spending 3K easy.

I wish the flowmaster catback had one exhaust outlet so I could just cut up my stock system and use the tips.

Does anyone have pics of the new magnaflow system installed?

I guess if I cant come up with anything I'll go with the B&B and Corey's headers. I think it looks the best.

[WVZR-1]

No snapshots but I believe with your desire to retain the factory "rectangular" tips I'd consider a system using the Super-Turbo Dynomax 17689 & 17690. These are true 2.75 inlets, retain the LT tips and flow very well. They're "advertised" to among the best.

With your headers, performance cats and a custom mid-system it could be ideal. They're somewhat more aggressive than stock and the balance of your exhaust modifications will enhance that.

To keep from "whacking" your system you might pick up an LT4 take-off and start from there.

Search this PDF for either 17689 or 17690 to take a look.

http://www.dynomax.com/assets/2008catalog_pdf/superturbo.pdf

There was a fellow on the CF in December that was offering up a pair very reasonable.

It's certainly not going to do anymore than "nick" the budget!

[Polo-1]

Just make your own..

I like 3 chamber Flowmaster sound. Cut the stock tip off, weld to a single in/out 3 chamber Flowmaster. Want more, buy a universal dual kit and start welding. I have done this on many cars/trucks. If you can't weld, talk to a local muffler shop.

[scholtmj]

Hib Halverson wrote an article about this somewhere.....

http://www.corvetteactioncenter.com/kb/question.php?qstId=534

[jonszr1]

i did a custom exhaust for my white 92 consisting of 3 in pipe a unique crossover and 3 in super turbo mufflers with dual 2/1/2 in exits . i dont have a way to take pics. but there is a sound clip of her at the strip on 1/28 at fontana. its on utube screen name zeusone and the vid of my car is jetta vs corvetteat acd .total cost of having it done 750 ,i had tips from a 90 exhaust put on the exits . at cruze its nice and quiet and i improved 2.3 miles an hr over the corsa that was on the car..

[Aurora40]

Stock pipes with an LT4 resonator and Dynomax Ultraflow 3" mufflers:

http://aurora40.dyndns.org/Hometown/corvettezr11990/exhaust/after3.jpg

http://aurora40.dyndns.org/Hometown/corvettezr11990/exhaust/after2.jpg

I loved the stock/sleeper look of them, but with headers the resonance was unbearable.

[-=Jeff=-]

Stock pipes with an LT4 resonator and Dynomax Ultraflow 3" mufflers:

http://aurora40.dyndns.org/Hometown/corvettezr11990/exhaust/after3.jpg

http://aurora40.dyndns.org/Hometown/corvettezr11990/exhaust/after2.jpg

I loved the stock/sleeper look of them, but with headers the resonance was unbearable.

you still use this? if not what did you change to?

[jonszr1]

if you change to the super turbo mufflers you will lose the resonance. at least mine doesnt have any and thats without a resonator

[Aurora40]

you still use this? if not what did you change to?
Corsa

[rkreigh]

stock 95 exh is pretty good, except it necks down at the resonator which is also a bit restrictive to cut the drone

it's a bit hard to find 2.75 x pipes but I think stainless works or any good shop can fab it.

b&b sell with X pipe same price as resonator

keep in mind all this fancy exh on a stock car is worth about 18 hp on a stocker, a bit more with headers the more mods and the more the LT5 flows, the more difference a really free flow exh makes , it's all about "where is the flow bottleneck"

I have ss 3" cats, b&b as the 3" is needed for a stroker Lt5 with porting, cams, ect.... LPE tested the same engine (LSV 390) with stock manifolds and stock exh and it lost over 60 rwhp at the tire!!

a modified stock 2.75 late model with x pipe and the better mufflers listed above is PLENTY for anything but the really big HP LT5s (600 hp) and will resonante a bit less due to pipe size

and as pointed out the corsa 2.5 system flows very well indeed. marc and lpe have tried many different exh systems and it comes down to alot of pref on sound quality more so than big dif in HP on mildly modified LT5s

the b&b can be had for less than a grand, I paid 980 shipped from tbyrne a while back on special

updating the stock late model exh is a much cheaper and very good alternative but you are paying for the labor and parts so it depends on finding a good shop with skills to do it reasonable (wish I could weld!)

you'll get plenty of power, and retain some very good stock stainless steel by sticking with the stock stuff which flows pretty good with the right mods.

marc h also confirmed that the stock muffs aren't that bad, it's the resonator as he confirmed backpressure at each "section" of the exh with detailed testing

see www.zr1specialist.com (http://www.zr1specialist.com) for a full report!!

I'm liking the c6 "flapper" design to crooze quiet, flip a switch to let it all hang out, b&b released this system, but I don't want to spend the $$ to update unless someone wants my B&B with X pipe

it's loud and rowdy,but doesn't resonante nearly as bad as the "early" b&bs that would run you right out of the car at anything below 2500

mine's not bad until 1600, and I have 4.10s so I cruize at 1800 and up

[USAFPILOT]

Is the 94 ZR-1 resonator more restrictive than the 96 LT4 resonator?

[ZR1Vette]

I am with you...I want to retain the 1990 muffler/tail pipes look but can the very restrictive mid pipe resonator>>
http://i17.photobucket.com/albums/b79/MRBLU/ZR1rearundercarriage-1.jpg

Based on the advise of those much more knowledgeable of the ZR-1 it looks like removing the 90 mid pipe and replacing with the 94+ mid pipe is the way to go to keep the OEM look..of course requires getting that part and having custom welding done.

[USAFPILOT]

Maybe Corey's headers into my factory exhaust then. I guess it would have to be cut somewhere to fit to the headers. I wonder what the sound and performance would be like? Then if I ever have the LT5 punched out, I could add the 3" exhaust.

Does anyone run headers into the factory catback?

[jonszr1]

i did when i first got my headers from corey .there were 2 extention pipes that came with the headers . you could have a muffler shop build you an x pipe in place of the resonator as the resanator is the big cork in the stk system

[Aurora40]

if you change to the super turbo mufflers you will lose the resonance. at least mine doesnt have any and thats without a resonator
I wanted straight-through mufflers for the performance (though maybe a SuperFlow flows enough, Callaway used them on their custom C4 exhaust systems).

The Corsa was basically me deciding I was sick of messing around with the exhaust. It's not my ideal system (I love the stock look for one) but it's good enough where it counts.

[jonszr1]

i so understand on getting tired of messing with exhausts .the super tubos seem to flow enough as they out performed the corsas by 3 tenths and 2 miles an hr at the strip .

[jeasen]

Any one considering the Dynomax Super Turbo mufflers (Part Number 17689 & 17690) on a 92 to 95 ZR1 should read this before ordering.

I have been looking for a stock looking muffler with the LT1 rectangular tips to replace my restrictive factory mufflers on my 1994 ZR1 for sometime. All the mufflers I have found have a 2 1/4" outlet. Not acceptable when I am looking to replace my perfectly good restrictive factory mufflers.

I was all excited when I read this post and read that the Dynomax mufflers cited above were a true 2 3/4" inlet and outlet muffler. I was going to order them but decided to check with Dynomax before going thru the exercise of ordering and then having to return them because they are exactly the same as the other mufflers with the 2 1/4" outlet.

I called the Dynomax tech line and found out that they do have a 2 3/4" inlet but only a 2 1/4" outlet the same as all the other mufflers out there.
The only way to get a 2 3/4" inlet and outlet is to order mufflers separately and make up the mufflers with LT1 tips yourself. I found that Pypes makes a LT1 tip for a 3" pipe.

Now that everyone knows about the Dynomax mufflers and the fact that they are a 2 1/4" outlet mufflers we need to consider something else to replace the restrictive factory mufflers with. BTW, the best price I found for the Dynomax mufflers is at Summit Racing is someone is going to order anyway.

The muffler options out there are endless we just need to figure out which ones do not drone. I hate drone! Any ideas? I would like to change mine soon. I hope this information helps a fellow ZR1 owner.

[Z51JEFF]

i did when i first got my headers from corey .there were 2 extention pipes that came with the headers . you could have a muffler shop build you an x pipe in place of the resonator as the resanator is the big cork in the stk system

You live in Ca,how did you get around the smog issue on a Ca car?

[tccrab]

You live in Ca,how did you get around the smog issue on a Ca car?

He lives in a county where they only require smog when selling or buying a car.

TomC
'Crabs

[Z51JEFF]

He lives in a county where they only require smog when selling or buying a car.

TomC
'Crabs

Another reason to hate California.

[jonszr1]

You live in Ca,how did you get around the smog issue on a Ca car?h is right inyo county one only has to smog rhier car when buying or selling. sure tou can have the back yard its 29 acres:dancing

[jonszr1]

sorry fo the typos i didnt have my glasses . it should read he is right . inyo county,one only has to smog their car when buying or selling. sure you can have the back yard its 29 acres

[jonszr1]

if one wants to use the lt1 tips , just step up to a 3 in super turbo muffler. then you dont have a cork in the system . the key is the super turbo. the ultra flows will drone. we tried them and sent them back on the dyno max 30 day return if you dont like them . my exhaust is as quiet as the stk exhaust with headers and just the right amount of sound when you floor it . as i shared before there is a vidoe on utube of the car ayt fontana on 2-28.its the one jetta vs corvetteat acd

[WVZR-1]

Any one considering the Dynomax Super Turbo mufflers (Part Number 17689 & 17690) on a 92 to 95 ZR1 should read this before ordering.

I have been looking for a stock looking muffler with the LT1 rectangular tips to replace my restrictive factory mufflers on my 1994 ZR1 for sometime. All the mufflers I have found have a 2 1/4" outlet. Not acceptable when I am looking to replace my perfectly good restrictive factory mufflers.

I was all excited when I read this post and read that the Dynomax mufflers cited above were a true 2 3/4" inlet and outlet muffler. I was going to order them but decided to check with Dynomax before going thru the exercise of ordering and then having to return them because they are exactly the same as the other mufflers with the 2 1/4" outlet.

I called the Dynomax tech line and found out that they do have a 2 3/4" inlet but only a 2 1/4" outlet the same as all the other mufflers out there.
The only way to get a 2 3/4" inlet and outlet is to order mufflers separately and make up the mufflers with LT1 tips yourself. I found that Pypes makes a LT1 tip for a 3" pipe.

Now that everyone knows about the Dynomax mufflers and the fact that they are a 2 1/4" outlet mufflers we need to consider something else to replace the restrictive factory mufflers with. BTW, the best price I found for the Dynomax mufflers is at Summit Racing is someone is going to order anyway.

The muffler options out there are endless we just need to figure out which ones do not drone. I hate drone! Any ideas? I would like to change mine soon. I hope this information helps a fellow ZR1 owner.

I haven't seen anything in this thread that indicated the 17689/17690 were 2 3/4 inlet and outlet. My comment was "2 3/4 inlet and retains LT tips". I'd still consider this a very viable system that should flow well and resonance should be manageable!

The C4 exhaust as it's suspended/hung from the chassis with metal hangers and only coiled springs is going to be very susceptible to resonance in the cabin. A potential fix for this although unsightly could likely be ballast. An exhaust tip extending beyond the fascia by a good bit is also a plus.

How much restriction would you expect is created by the 2 1/4 outlet? Bettcha there's no "SOP" feel! Is there a definitive difference on dyno test vs. anything else? Probably on nothing other than larger cubed or modified cars. Maybe even then, NOT!

It's certainly a "cost effective" option that retains "the look"! I believe that was/is the OP's goal!!

[jonszr1]

you could put in a a 21/2 in xpipe and the do the 3 in super turbo mufflers and transfer the tips off your old exhaust as i did .i want the 4 outlets like the 90 on my 92 , x pipe cost 175 mufflers 115 inc shipping and 150 maybe in muffler shop labor cost .paint the mufflers and tips black and it will look stk to most .if one really wanted to fool people you could cut the case off your stk resonator and cover the xpipe with it .