I had a test pipe made at a local muffler shop when I had the muffler done on my wifes car, they built the cost into the wifes repair bill(LOL, yep, I suck!).

I just measured the length from the flanges on the y-pipe to the b-pipe, ~18". They used 2 1/4"ID mild steel. They made the pipe's flanges the same way they are on the RT-Cat, flared not welded on. The side for the Y-pipe got a 2-1/2"ID flare and the b-pipe got a 2 1/4"ID flare. An O2 fitting was welded on as far back as possible on the pipe. Install was cake, I did it in cunjunction with the short shifter.

According to my "dyno-butt-ometer" their are good increases above 3000rpms. As a guesstimation, ~10hp over the RT-cat w/the straight after cat extension. The low end feels perhaps a bit less, but my "dyno-butt-ometer" isnt that accurate.

The really good news is that the ECU has not thrown a code yet!!!!!!!! I was quite worried about this.

EGT's are also down ~200c! Imagime that?

The sound is quite nice also. I still have the stock muffler and it sounds very smooth at idle, it has a light resonation around 1500-2500rpms, some exhaust wrap will fix this. At WOT its loud, but not Stillen muffler loud.

They arent too strick about emissions here in Lousy-anna so I am not worried about inspections.(pipe down tree huggers)



[Edited by MardiGrasMax on 10-04-2000 at 09:02 PM]

 

I hate the cold and being able to breath too!

 

ain't it illegal to drive w/out a cat?

 

yeah if you pass emissions they really cant do anything to you and no cop is really gonna check anyway. my brother is running a straight pipe on his civic and he passed emissions just fine. the engine should run clean enough to pass without.

 

Where did you tap your EGT probe? On the exhaust manifold? If so, off which cylinder? I'm getting my car ready for Nitrous, so I want to get an EGT gauge. Which gauge do you have?

 

I have the APEXi electronic/analog EGT gauge, its sweet! It has a setting that will show you the peek temp after your run, very usefull! It also has a memory setting that will replay up to 30 seconds, I havent used it yet but for track tuning I imagine it would be real usefull. The best feature is a warning light and 12v output. You can wire this so that it the EGT's go higher that 800c (or what ever) it will cut the nitrous off! It was about $250 with the probe. Autometer makes a regular gauge that is cheeper but I liked the extra bells & wistles.


I have the probe taped into the front exhaust manufold where the 3 runners come together. You can get a second temp. probe for ~$60 and put it on the back bank of cylinders and use a switch so change between them, but it looks like a pain in the a$$ to put it on the rear manifold. When I drilled the probe hole and taped it I left the car running so the metal chips would blow out. When I screwed the probe adapter into the taped hole I used some of that high temp exhaust manifold repair goo as if it were teflon.