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#1 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Been back and forth with a few different pipe combos- but the long story made short is that the 3" all the way back with the SW 3" X-Pipe makes great top end with plenty mid range torque using LS7 cats from a C6 Z06. It is faster than the stock mufflers on 2.7" pipe without cats. It's Freaking Loud, but then running stock muffs catless on longtube headers was a bit obnoxious too. There is drone, I will probably go to turbo mufflers again when I get some more money to spend. Additionally, I really like running catalysts again. Birds don't fall out of trees when you drive by, you don't get dirty looks from the beach hippy in a Prius, and it quiets things down and quells those decel backfires quite a bit. Lastly, I priced various aftermarket bullet cats with a 3" slip connect, but how can you beat factory Cats from a 505 hp car? You can tell it is running clean, the pipes aren't even blacked up yet and there is no odor at all. OEM parts FTW.
![]() ![]() ![]() ![]() I had recently installed some LT5 headers and I found these 2" longtubes that were already setup for air injection. These aren't SW headers, but a mystery brand- maybe made by Morrison Motorsports in GA is the best guess I have so far. Anyhow, they fit perfectly and really woke up the car. ![]() I was running cat-less for a couple of months after the header install (using stock mufflers), but I got tired of my eyes watering every time I pulled up to a stop light with my windows down. Since I had some oem LS7 exhaust that was a stillborn modification on my C6 that I decided to not go through with, I put those nice 3" piped cats to use. They are pretty compact and just fit under the heat shields in the tunnel. ![]() |
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#2 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Notice that we were able to retain the use of the clamping system so the pipes can be separated for service.
![]() ![]() .. Factory air injection still in place. Does this car even have headers?? Stealth- Because California. ![]() .. Also I got a good lesson in installation technique at my local muffler place. Check out the diff clearance. Perfect 1/4" spacing at rest. My old B&B sure wasn't able to achieve this, but it does have a lot to do with jacking up the center piping in place with a jack of some kind, then tightening the clamps before letting it hang. ![]() more pics: ![]() ![]() |
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#3 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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#4 |
![]() Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Real nice job Mike !
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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#5 |
![]() Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,154
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Those might be Watson headers
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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#6 |
![]() ![]() ![]() Join Date: May 2007
Location: Peoria, AZ
Posts: 9,154
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Concur. I would have had em coated as well but that might have not have been stealth enough for CA
Interesting rear tips really fill out that cutout
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director ![]() 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 08-28-2013 at 08:01 PM. |
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#7 | |
![]() ![]() Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,794
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I like the looks as the New Style Outlets match the cutout perfectly ![]() Nice Photos Mike and not too many notice the gap between Exhaust and Differential but here is another idea ![]() SW Headers ZR1CORVOR and SW Exhaust ZR1CHAMSW were installed on both the 90' and 91'. For both the 90' and 91' a Copper spacer was added (1 x 6 inch copper pipe with pipe end caps and pipe coupler) to keep SW exhaust 1/4 inch away from Differential Housing. Copper spacer added (two each 1 x 6 inch copper pipe with coupler and end caps) to keep SW exhaust 1/4 inch away from riding against Differential Housing. The end caps and coupler actually keep the spacer in place without any ties. ![]() ![]() I set the two rear hangers so they pull the exaust up tight against the copper spacer. Also set the rear "L" hanger so there is freedom of the exhaust system to move to the rear at least 1/2 inch when hot.
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Left Clickable links ![]() -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 08-28-2013 at 09:39 AM. |
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#8 | |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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I'm also considering dually out with a pair of conventional tips because the best way to make these c4's stop resonation from the back hatch area seems to be stopping up dual outlets to a single one...like Corsa's do and GM as well with the factory fake 2nd outlet. I think it's about time to figure out how to get the NPP valve hooked up on my car. Also very likely will go to some quieter muffler type as mentioned in my first post. The main question I have on GM's NPP system is what controls the valves to open up at roughly 3500 rpm besides low manifold vacuum? If there is electronic control, how do you adapt it to older cars? |
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#9 |
![]() Join Date: Jun 2012
Location: PA
Posts: 772
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Wow, sweet job
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Joe 1990 Bright Red ZR-1 #2599 |
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#10 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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I'll try to make something on Saturday when I return home. It does sound great when you are going for a 10 mile drive to open it up and play, but difficult to travel a highway in for any length of time in 6th gear.
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