Put your 3.5" exhaust on the back burner for now. Buy a good 3" premade system with a remote wastegate or get one custom made. Even a 3" system is difficult to position properly, there really isn't that much room to spare. I personally like 3" to the muffler, then 2.5" out the back. As exhaust gases cool, you can go to a smaller pipe and flow the same mass of gas, this also helps keep the velocity up.

Marine speed guys are not who you need to talk to concerning an exhaust system for your car. These guys deal with engines that make a certain amount of power and run at that power for as long as necessary. They do not have any major plumbing issues to deal with, all in all, its just a totally different world. Cars are different, especially something that you can drive on the street. It's not like you are going to make 350hp throughout the RPM range, nor are you going to be able to run sustained at high hp, remember this is a street car that may or may not see any track time.

I really do not think that you realize what you are having built and I feel there are many things that you really haven't thought out. By dropping the compression so much, you have robbed the engine of the thing most of us love so much about these engines. I really expect your engine will feel dead, till boost comes on, but when the boost comes, it will be explosive, not really what you want in a street car.

The truth is that you are not yet setup to make 350hp. The engine sounds capable, but you can't feed it enough fuel with your present setup. There are other problems too and I suspect that you are going to have deal with intake restrictions before you have to worry about a 3.5" exhaust.

I wish you luck with it, it's been off the road for a long time now. So don't get carried away and please break it in properly.

ps. zero clearance = seized and loudest isn't necessarily best.

• talked to the local speed shop about a exaust system...., Jordan, Fri, 27 Jul 2001 22:27:08
  • The low down on exhaust size, EricZ, Sun, 29 Jul 2001 16:30:47
  • let me rephrases somethings..., Jordan, Sat, 28 Jul 2001 16:25:26
    • Dude, someones yanking your dipstick........, SteveW, Sun, 29 Jul 2001 16:39:18
    • last i'm going to comment on this, bryan , Sat, 28 Jul 2001 18:58:55
      • here's a link to the engine builder.............., steveC inBC, Sat, 28 Jul 2001 23:52:17
      • I am srooy but,........, GM, Sat, 28 Jul 2001 19:42:44
  • Re: talked to the local speed shop about a exaust system...., GM, Sat, 28 Jul 2001 13:52:33
  • after making about a dozen phone calls and uncounted searches, WASSAAB, Sat, 28 Jul 2001 11:34:47
    • saab exhaust easy to fab...the secret is out., chrisx, Sat, 28 Jul 2001 14:03:32
  • here's something constructive, dave n, Sat, 28 Jul 2001 10:14:19
  • Re: talked to the local speed shop about a exhaust system...., Beaudreau, Sat, 28 Jul 2001 10:09:25 <-- Viewing This Message
  • you're high if you're talking 350 + HP...sorry...make 250 first, bryan , Fri, 27 Jul 2001 22:39:47
    • OK, well, you've got some things going on,, bryan , Sat, 28 Jul 2001 16:09:11
      • Re: OK, well, you've got some things going on,, chrisx, Sat, 28 Jul 2001 18:19:50
    • Im high???right. you have no idea what kinda heat this car has, Jordan, Sat, 28 Jul 2001 01:01:55
      • What did all this cost?, Tino, Sat, 28 Jul 2001 22:03:09
      • I can beat you! (details), Rawll, Sat, 28 Jul 2001 16:39:25
      • Interesting Project!, Kevin K , Sat, 28 Jul 2001 11:25:10
      • Re: Im high???right. you have no idea what kinda heat this car has, A12, Sat, 28 Jul 2001 08:45:54
      • you're high all right. details omitted for brevity. n/m, chrisx, Sat, 28 Jul 2001 01:42:11
        • smokin', smokin', smokin'...., kooch, Sat, 28 Jul 2001 02:16:35
          • Do you want some cheese with that??? WTF people???, Jordan, Sat, 28 Jul 2001 06:34:57
            • i see..., chrisx, Sat, 28 Jul 2001 13:07:45
      • sounds mighty good but I would have ot argue with the loudest.., Mr.SPG, Sat, 28 Jul 2001 01:04:42

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