A stock exhaust might not be any more resrictive than your crushbent 2.5". I'll repeat what others have said. Your current exhaust will sound completely different with a turbo that with your super. Don't change anything until you get that kit on. See if what you have is OK 1st.

 

+1 to get the turbo on first. Cops won't give a second look to a 2.5" free-flow muffler if you aren't constantly on the boost. The turbo is WAY more conspicuous than the exhaust is.

 

Don't think the crushbent stock 1.875" is more restrictive than crushbent 2.5"?

 

by the way, that crush-bent 2.5" REALLY made a lot of difference with my supercharger. it really became considerably quicker w/ stock pulley. dont know how it performed with 62.5mm pulley because i shredded a belt next day after pulley installation and didnt drive car since :/
i did push it pretty hard few times with new pulley and of course it was way faster but i never redlined it past 2nd gear to really see how good it became

 

OK, so I'm an idiot. Never claimed otherwise. My thesaurus has crushbent listed as another word for restriction. I haven't seen a stock exhaust is so long I guess I remembered them wrong. Thought they were mandrel. Dee dee dee.

 

most stock exhaust pipes are mandrel bent i thought. I dont recall seeing crush marks on the stock exhaust when it was still around.

 

what you do is open up the stock exhaust slide the straight pipe through it, drill a **** load of holes in the straight pipe and wrap it with housing insluation, then put it back in the stock muffler body. it will work like a cherry bomb and look completely stock, that and with the turbo on you shouldn't have a problem. just make sure you patch it up good so the smog tech doesn't look at it too closely.

 

i have no problems with smog. afterall im going to put megasquirt and that turbo definitely doesnt look stock. now... if only i could get a sticker from one of those carb'd kits

 

and that would be illegal, so don't even think about it.

 

right...

 

False. I measured backpressure on a stocker and I got 8 psi at just 6 psi of turbo boost. I measured the backpressure on mine which has a handful of crush bends, and I got ~3.5 psi at 10 psi of boost, with a Maremont Metal Cat.

 

so yeah, i installed turbo today and sound is awesome! idles silently. at full throttle my turbo is WAY louder then exhaust

 

told ya' so.