Starting the mods

[-=Jeff=-]

that works.. as soon as the Doc okay's me for a ladder I can check the attic

[WARP TEN]

Originally Posted by -=Jeff=-

when do you need the 93-95 resonator. I am quite sure I still have one, however I will not be able to get at it for a while.. due to a medical issue with my right foot..

Had a tough time getting it out of your mouth again Jeff? --Bob

[WARP TEN]

Originally Posted by Subfixer

First mod I'd like to attack will be headers, so here are the questions...


Will Stainless Works Headers/Cats bolt up to the stock exhaust?
I want to keep the nice "quiet" stock exhaust.


I'm pretty good with a wrench, but is header install a one man job?


I thought I read somewhere that there are 2 different size resonator internal ID's.


Which years had the larger internal ID?


Mark's chip is also in the plan, but the top end porting will have to wait until next year. Maybe by that time I'll have saved enough for a 415...


Enough questions for now.

Looks like you have gotten some good answers here, as I would expect. The 93-95 resonator is in fact larger in internal diameter, less of a neck down. Here is a article Marc did on that:

http://www.zr1specialist.com/HAT%20W...rly%20Cars.pdf

Shops like Marc Haibeck's and others who have take off exhausts may be able to supply one if you can't find it from one of the other members, although of course there weren't too many made originally. There are quite a few posts here about exhaust characteristics and variations that might be interesting reading for you. After 20 years of mostly Corsa systems on the '93 and '95, I finally went back to a stock system (behind SW headers, no cats, with Haibeck 510 pkg.) for the quiet and lack of resonance. But I also added Quick Time Performance electric cutouts in front of the mufflers with a rocker switch hidden under the passenger side console carpet. (Tony Davila had done this with manually operated cutouts and it looked doable to me).

I had Marc do the cutout installation and I did the switch but any competent muffler shop could also do it with proper guidance. I like the ability to go from stock quiet to wide open pipes when I wanted to (like at the NCM track) or something in between with a little rumble for around town. While Marc normally installs cutouts where the stock exhaust pipes curve out from the center, that position eliminates the spare tire carrier, which I wanted to preserve, so we figured out how to put them just in front of the mufflers instead and I kept my spare. I don't believe there is a big difference in performance in either location as they are so far down the exhaust.

Here is a link to one of the very long posts on exhausts but there are many; just search "exhaust cutouts" : http://www.zr1.net/forum/showthread....utouts&page=16. This page is discussing cutouts, and shows both Marc's preferred installation spot as well as mine. But here also are a couple of pics of mine-Bob

[-=Jeff=-]

Originally Posted by WARP TEN

Had a tough time getting it out of your mouth again Jeff? --Bob

Lmao, I wishImage1546448418.272491.jpg


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[Subfixer]

I toyed with the idea of cutouts, but probably won't do it initially.

What I'd like to try is to have a straight through pipe installed in the stock muffler with a cutout supplying the pipe somehow.

The muffler would have 2 inlets and the single stock outlet. Not sure if there's enough room to do that.

[Ccmano]

Originally Posted by Subfixer

I toyed with the idea of cutouts, but probably won't do it initially.

What I'd like to try is to have a straight through pipe installed in the stock muffler with a cutout supplying the pipe somehow.

The muffler would have 2 inlets and the single stock outlet. Not sure if there's enough room to do that.

If that’s your plan don’t bother with the expense. The stock mufflers are not particularly restrictive. Simply have the resonator removed and replaced with an X pipe. You can add the cutouts to bypass the muffler later.
H

[WARP TEN]

Originally Posted by Ccmano

If that’s your plan don’t bother with the expense. The stock mufflers are not particularly restrictive. Simply have the resonator removed and replaced with an X pipe. You can add the cutouts to bypass the muffler later.
H

FYI, removal of either the stock mufflers or the resonator will cause an increase in audible resonance. The LT5 creates significant resonance frequencies at two rpm points, about 1800 and 3400. The mufflers deal with one frequency and the resonator handles the other. Forget which is which. --Bob

[WARP TEN]

Originally Posted by -=Jeff=-

Lmao, I wishAttachment 8837


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Sorry to see that Jeff. My wife had foot surgery a few years ago and it was not fun for quite a while. Hope you are better soon--Bob

[-=Jeff=-]

Originally Posted by WARP TEN

FYI, removal of either the stock mufflers or the resonator will cause an increase in audible resonance. The LT5 creates significant resonance frequencies at two rpm points, about 1800 and 3400. The mufflers deal with one frequency and the resonator handles the other. Forget which is which. --Bob

Interesting.. I will say my LT4 catback with Watson long tubes and bullet cats is quiet. If I could get the sound of Corsa at cruise without the screaming Banshee at WOT that wouldl be perfect for me

Originally Posted by WARP TEN

Sorry to see that Jeff. My wife had foot surgery a few years ago and it was not fun for quite a while. Hope you are better soon--Bob

Thanks Bob, this is round 2, last year was the Clutch foot, this year to go pedal foot.. hopefully only another week in my cast.. Had surgery on Dec 12th

[secondchance]

Originally Posted by WARP TEN

FYI, removal of either the stock mufflers or the resonator will cause an increase in audible resonance. The LT5 creates significant resonance frequencies at two rpm points, about 1800 and 3400. The mufflers deal with one frequency and the resonator handles the other. Forget which is which. --Bob

Typically resonator takes care of low RPM and muffler the higher RPM resonance.