i'm an idiot

[OhsoSHO]

Well, I found out why my car went from running high 14's to mid 16's, lol. There was a gasket on the exhaust pipe before the first cat that was shot. Also, the super turbo mufflers were rusted all to ****. The muffler guy suggested that I lose the y-pipe and try a single. Very good suggestion. The car pulls much better than it did before and sounds much nicer.

 

[SHO--ripper]

Glad to hear you fixed you problem. thumb
BTW welcome to the forum.

 

[sdpatt]

He suggested that you try a single what? A single catalytic converter? That had better be a big converter or you will lose some flow capacity and power.

There are no gaskets upstream of the cats in any of the Y-pipes made for the SHO. The only gaskets in the exhaust system are between the heads and the exhaust manifolds. The only gasket on the 3.0L, manual transaxle SHO is the donut gasket between the Y-pipe and the cat-back system. If it leaks, you get more noise, but not a performance loss. The coupling between the exhaust manifolds and the Y-pipe is simply flanged and metal-to-metal.

 

[SHOguy 92]

He couldn't have suggested lose the Y-Pipe something has to run off both headers? You have a pipe coming off each header and it runs into one pipe makes the shape of a Y. You mean he said to go with 2-1 exhaust and ditch the 2-1-2 design the SHO comes with. So now you only have one exhaust outlet and im guessing its at least 2.5" piping. Right?

 

[SHOguy 92]

Scott, I thinkhe means the doughnut gasket, thats what got rusted out on mine. that isn't anywhere above the cats thats behind them right where the Y-Pipe connects to the cat-back. About right underneath the front seats. And yes lots of noise VERY loud when that things rusted.

 

[sdpatt]

SHOguy11:
Scott, I thinkhe means the doughnut gasket, thats what got rusted out on mine. that isn't anywhere above the cats thats behind them right where the Y-Pipe connects to the cat-back. About right underneath the front seats. And yes lots of noise VERY loud when that things rusted.

Thank you. I am very familiar with the donut gasket. I have probably replaced mine 20 times over my car's 280,600 mile lifetime. I am also very familiar with the exhaust system as I have replaced the stock Y with a SHO Shop, then a Performance Plus Y and swapped the stock cat back with a Borla. All by my own hand.

 

[OhsoSHO]

The pipe is cut right in before it broke into the y shape. The air filter that was in the car when i bought it was shot. Litterally falling apart, and clogged all to ****. I replaced it today with a K&N and can actually notice a very large difference. There's a section of concrete road near my house that is exactly a 1/4 mile long. I managed to hit around 95mph by the end of it. So, I'm pretty sure that it's capable of high 14's now. I think I'm going to get a 75mm MAF and start saving for a quaife.

 

[Dr.Evil]

so you have true duals now? shrug

 

[OhsoSHO]

There's a section at the end of the pipe that splits into a y shape. It breaks into two sections. One goes a short distance to the left. The other makes a 90 degree turn to the right. This was sawed off with a sawzall. Now it's a 2-1-1 instead of a 2-1-2.