Anyone with Stainless Works exhaust system with the turbo chambered mufflers?

[HAWAIIZR-1]

Originally Posted by mike100

I had single outlet turbo mufflers on my last 95 LT1 car and it wasn't excessively loud. Previous to that the last owner had some 2.5" L98 Borla twin outlet mufflers put on and it was crazy- the single outlet thing is a must. I realize single outlet mufflers aren't very vette-like, but this was ok for 'ol purple-erkel during the year I owned it.


That's why I suggested getting parts together for a custom NPP job on a more universal hi-perf muffler on the stock pipes. The NPP mufflers or flaps from a C6 are what will cost you. The rpm switch, junkyard solenoid, tubing, vacuum switch etc will be about $110. The project takes time- but it is fun to be able to have a selectable muffler. The other reason is I believe the stock pipe diameter and chosen pipe thickness is part of the acoustic engineering that went into it. I x-piped the resonator on my 1990 pipes and it barely got louder- I know if I cork up the right muffler and then have a flap on the second outlet, it ought to be able to stay similarly quiet. btw, my car is a 91, but I got Han's old 1990 stockers and Dominic's old Magnaflow x-pipe.

As far as the smog thing- yeah- I ran my headers while I could, but I drew the Star station inspection so I wasn't so sure I'd have a prayer at passing the extra thorough visual. The car is back to stock manifolds. I have to admit it is very tame to daily drive (but you don't really get used to losing the extra pop that headers, porting, and cat back gave you). Long term I'm looking into buying a cabin in an unenhanced zip code to get out of the bi-annual inspections, short term I'm thinking about doing NPP muffs as described above on my stock pipes since I have all the parts for the control side still hanging on my car.

Hey, I really do appreciate all the info you are sharing and so much to consider. I'm glad I have folks to run this stuff by so I don't reinvent the wheel, especially with someone living in Cali that understands the pain to go through. I don't have much knowledge about SMOG too since only one truck (My 03 Lightning) and I don't count the wife's VW Golf since 2014 and just required by CA bringing the car in state.

I was thinking about the mufflers and what you mention about single tip. I already have a new set of Dynomax with single in/out 3" I was going to do some experimenting with my 90 B&B some years ago. I would have to probably get new 2.75 to match pipe if so or reduce the inlet and see how that works. I did find a 2.75 x pipe but have not confirmed the center to center and length to see how much work is involved or just go the Magnaflow (I almost bought one from Gunny a few years ago). I have to do more research about the resonator on the 95 to see how restrictive and worth the gain or resonance to eliminate with x pipe. The cool thing about the single outlet idea is I found a tip that looks just like stock on 95 with the wide single opening, but only 2 1/2" inlet. Then there are others that branch off into two tips from a single. Not sure if that is the route to go or like you said and build a custom NPP mufflers to stock pipes.

I'm on the fence to hack up the 95 exhaust and was looking to initially just remove and keep (but for what?). I always keep stock stuff that I will probably never use and all of it is just getting in my way. I have all the bolt on stuff from my 90Z, Lightning, and Harley and need to just get rid of the stuff. No more room. I have this thinking that the next owner will/may want all the stock stuff. WTF?

Thanks again for your thoughts and info. I wish you were a lot closer. Are you thinking about attending the ZR-1 Gathering in Vegas during Oct if that pans out?