I'm looking into putting an exhaust on my 2000 tib. This exhaust would be fabricated at my fathers shop, and I was wondering what you guys would suggest in the design end. What Diameter tubing should I use? The muffler part is already taken care of, he has his own patented design. Dual...single? Any information you guys provide would be helpful, I just want to see what you guys look for in an exhaust system. Also, has anyone ever seen an exhaust system with a cat bypass valve controlled by a solenoid? Just curious.

 

what are your goals?

ive read about cat bypasses but their is lik .0001% chance that you would ever need on a tiburon.

 

sounds like your N/A so go with the 2.25 mandrel, no dual. and dont worry about the cat bypass...

 

Sounds good, I'd normally just ask my dad, but he wants me to research and make it something I can call my own lol. I wasn't considering the cat bypass, I jsut saw it and thought it was cool. Thanks.

 

you definately wouldn't wanna do a dual

 

Is that because there wouldn't be enough back pressure on the engine?

 

Please do some searching man. Exhausts have been beaten to death here.

 

You don't want back pressure. You dont want a dual exhaust because they are just for looks if you have one pipe then makeing it go into two makes the flow worse. Just keep everything as straight as possible and mandrel bent is what you want because ripples on the inside of the pipe hurt flow. I have a 2.25 mandrel bent exhaust. Depending on what you plan for the car you may want a glass pack in there somewhere. If it is for the street then a resonater, cat and a small glasspack (can muffler) is what most people use (I do). Some people decide to replace the resonater with a very long glasspack for quite, but I dont konow about its flow. If I were making my own exhaust I think I would decide to go with one glasspack (not very long maybe 20 inches or so) and a cat nothing else. What kind of muffler are you using such as a very high flow almost no resistance or alot of resistance?

 

Um, yes you do. The exhaust system requires a certain amount of back pressure to keep the flow of exhaust steadily moving towards exit. No "back pressure" or exhaust "pulse" and you will have little hp and torque in the lower rpms. 2.25" is sufficient for n/a applications. 2.5" is pushing it for n/a (IMO) and you might lose a little low grunt especially if you use a high flow cat. 2.5" is entry level for turbo with 3" being sufficient for most turbo apps.
Like Redz said, but I'll say it more nicely, use the search function. There's a million and one threads about this very topic.

 

No you dont want backpressure. But you do want each pulse to be equally spread out in order to create a nice flow of each pulse pulling out the next one. This is why an equal length header is optimal for horsepower. There was a huge post about this a long time ago.