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View Full Version : Got a stock SC. Where to start with exhaust?



Terrible Juan
10-24-2005, 02:41 PM
Sup guys, just picked up a 91 SC, completely bone stock. Has a newer longblock in it so the HG's and everything are cool. I don't want to have to worry about the HG's going again so I decided to start with the exhaust first.

I don't want this thing to be all loud, just looking to do what is necessary. Should I start with replacing the resonator to a hi-flow unit? Also, it has a new midpipe so the cats aren't clogged or anything.

Where do you suggest I start? What are some quiet hi-flow mufflers? Don't want it sounding like a V6 'stang with Flowmasters *barf* :D

My main goal is to eventually add a pulley and squeeze some more boost out of it. I can't get enough of that whine!

wezar
10-24-2005, 03:00 PM
Welcome. Maybe you could do a search for even more ideas. But I would start with porting the exhaust manifolds.(or picking up a set from Wynn aka. T-Bird 88)

http://www.texasthunderbirds.com/

Then get a new set of downtubes. (maybe from T-Bird88) Then connect that up to a new Magnaflow resonator (T-Bird 88 Sells em)

If you need cats I would suggest Summit who sells Catco cats for about $100.
I used Catco CTO-6906

http://store.summitracing.com/default.asp?Ntt=Catco+CTO-6906+&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=0&target=egnsearch.asp&x=28&y=9



Take it all to your favorite trusty muffler shop and have it installed. Some say you can get away with the stock catback. Some use the flowmaster. Others have had a custom catback built. You will find out that the newer gastank (92-97) allows a more direct route for the rear exhaust which is best for high output engines.

While you are changing the fuel tank you can add the 190lph or 255lph fuel pump (Rich Thompson sells a nice kit)

http://www.mn12performance.com/


Supercoupe performance has a nice (but not cheap) system that has been used by lots of members.

http://www.supercoupeperformance.com/

Jeremy_K
10-24-2005, 03:05 PM
The flowmaster system sounds good as long as you have cats. I deleted my cats and it got real loud.

Terrible Juan
10-24-2005, 04:24 PM
Welcome. Maybe you could do a search for even more ideas. But I would start with porting the exhaust manifolds.(or picking up a set from Wynn aka. T-Bird 88)

http://www.texasthunderbirds.com/

Then get a new set of downtubes. (maybe from T-Bird88) Then connect that up to a new Magnaflow resonator (T-Bird 88 Sells em)

If you need cats I would suggest Summit who sells Catco cats for about $100.
I used Catco CTO-6906

http://store.summitracing.com/default.asp?Ntt=Catco+CTO-6906+&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=0&target=egnsearch.asp&x=28&y=9



Take it all to your favorite trusty muffler shop and have it installed. Some say you can get away with the stock catback. Some use the flowmaster. Others have had a custom catback built. You will find out that the newer gastank (92-97) allows a more direct route for the rear exhaust which is best for high output engines.

While you are changing the fuel tank you can add the 190lph or 255lph fuel pump (Rich Thompson sells a nice kit)

http://www.mn12performance.com/


Supercoupe performance has a nice (but not cheap) system that has been used by lots of members.

http://www.supercoupeperformance.com/

Thanks for the valuable info! I did a search and wasn't able to find what I needed. Probably didn't do a good enough search though.

I'm guessing the downtubes are part of the midpipe that attach to the headers? I've seen a pic of the midpipe and it they have 90* bends, right?

Jeremy_K
10-24-2005, 06:40 PM
Thanks for the valuable info! I did a search and wasn't able to find what I needed. Probably didn't do a good enough search though.

I'm guessing the downtubes are part of the midpipe that attach to the headers? I've seen a pic of the midpipe and it they have 90* bends, right?
Wynn's downtubes are designed to go from your factory manifolds right to your resonator. I had to cut them shorter with my flowmaster resonator.