Mod To Stock Mufflers

[Paddy_SP]

Originally Posted by Gunny

Another suggestion, assuming that it will work with any government emissions requirements that you have ...

install long tube headers, no cats, and late model stock exhaust. there is no drone, almost stock quiet in the cabin, and a decent sound (subject, I know) behind the car. My current setup is SW headers, no cats, and stock exhaust from a 96 LT4 (h-pipe behind the resonator) and it works well for me.

Many thanks for your thoughts! Emissions regs are generally overlooked around here, so I very much doubt that would be an issue! No - the problem would be that there are so few ZR1's in this country that I'd have to ship an exhaust in from abroad, and that would be cost-prohibitive.

[Bob Eyres]

A low cost approach would be to just remove the mufflers and use eliminator, (straight) pipes. Also replace the resonator with an Xpipe.
I don't know if this will give you the sound you're looking for, but at least you won't trash the expensive stock mufflers, and you can return to stock anytime.
This could be accomplished by any local muffler shop.
I'd love to drive my ZR-1,(see below), through the English countryside, loud as hell.

[Paddy_SP]

Originally Posted by Bob Eyres

A low cost approach would be to just remove the mufflers and use eliminator, (straight) pipes. Also replace the resonator with an Xpipe.
I don't know if this will give you the sound you're looking for, but at least you won't trash the expensive stock mufflers, and you can return to stock anytime.
This could be accomplished by any local muffler shop.
I'd love to drive my ZR-1,(see below), through the English countryside, loud as hell.

Many thanks - I may well do something along these lines - I wouldn't use pipes that were completely straight-through as I live in a village where they wouldn't be appreciated, but might use some relatively 'robust' mufflers instead. Having said that, my Aprilia RSV1000SP uses a full-race titanium exhaust!

[Gunny]

Re-reading your original post and the various suggestions, it occurred to me (I'm assuming) that you have a stock 90 exhaust. Since shipping presents a problem for obtaining a complete exhaust system, it's probably best to work with what you have.

Near as I can tell (and I've checked the measurements of the 90 as well as the later years' exhaust system) the two bottlenecks of the 90 exhaust in terms of performance are the resonator and the mufflers, all of which have restrictive connectors to the exhaust pipes which should be 2.75". A couple of things you can do and still utilize your existing system is to replace the center resonator with an x-pipe (or less restrictive resonator) ... any good exhaust shop should be able to build an x-pipe to your specifications. The mufflers are also restricted (necked down) on the exhaust pipe side plus one tip is closed off ... you might want to look at the Dynomax line of mufflers to see what looks good for your situation. Dynomax muffs are not terribly expensive and should be able to be shipped easily enough.

Anyway, these are a couple of more ideas for you mull over ... good luck on finding the best solution for your needs.

[Paddy_SP]

Originally Posted by Gunny

Re-reading your original post and the various suggestions, it occurred to me (I'm assuming) that you have a stock 90 exhaust. Since shipping presents a problem for obtaining a complete exhaust system, it's probably best to work with what you have.

Near as I can tell (and I've checked the measurements of the 90 as well as the later years' exhaust system) the two bottlenecks of the 90 exhaust in terms of performance are the resonator and the mufflers, all of which have restrictive connectors to the exhaust pipes which should be 2.75". A couple of things you can do and still utilize your existing system is to replace the center resonator with an x-pipe (or less restrictive resonator) ... any good exhaust shop should be able to build an x-pipe to your specifications. The mufflers are also restricted (necked down) on the exhaust pipe side plus one tip is closed off ... you might want to look at the Dynomax line of mufflers to see what looks good for your situation. Dynomax muffs are not terribly expensive and should be able to be shipped easily enough.

Anyway, these are a couple of more ideas for you mull over ... good luck on finding the best solution for your needs.

Thanks for the constructive suggestions - I'll look into the Dynomax line and consider fabbing up a restrictor myself, as we have very few competent muffler shops in this part of the world.

[Mr Blue]

As previously stated, the stock resonator is the big restriction. The later ZR-1 and LT1 resonators are much less restrictive. Complete exhausts might be prohibitive to to ship, but you could just substitute the later resonator. I don't know the weight, so I can't speculate on the shipping. But used LT1 exhausts can be found for $100-200 USD. Cutting the resonator out and just shipping that would save some cost. Just a thought...

David

[Paddy_SP]

Originally Posted by Mr Blue

As previously stated, the stock resonator is the big restriction. The later ZR-1 and LT1 resonators are much less restrictive. Complete exhausts might be prohibitive to to ship, but you could just substitute the later resonator. I don't know the weight, so I can't speculate on the shipping. But used LT1 exhausts can be found for $100-200 USD. Cutting the resonator out and just shipping that would save some cost. Just a thought...

David

And a good thought it is too, David; I will certainly add it to my list of options!