TR6

Today, I installed a used cat bypass that I bought. I don't know the brand and neither did the rennlister that sold it to me. It was on his car when he bought it. No markings on it that I saw. If anyone recognizes it from the photos, please let me know what brand it is.

The installation went easier than I expected. Its literally a bolt in application and the fit was perfect. I'm happy because I plan to keep the original cat and swap it back when needed.

My car already has a secondary bypass but is still running the stock primary. It had a deep rumbling sound before with the secondary bypass and the stock cat , but when I first fired it up with the cat bypass today, it definitely has a louder roar to it when you get on it. I took it out for a half hour of road testing and was pleased with the sound. At highway speeds, its not much louder than it was with the stock cat, until you open up the throttle. But for highway cruising, to me anyway, it is very tolerable. Accelerating from a standstill to redline through the gears, it absolutely roars. I love it. Very addictive. But I plan to keep the stock primary muffler on it because I think it would probably be too loud with all three bypassed at once.

The butt dyno feels like there is an improvement in acceleration. Or maybe its just the extra adrenelin from the sound. But I really do think it pulls stronger now with the cat bypass. I'd like to dyno it with the stock cat and then dyno it with the bypass. Maybe I'll get a chance to do that in the next couple of weeks. If I do, I'll report the results here.

Here's a couple of photos. Nothing fancy to look at, but very functional. I do have a question: Will not having the heat sheild on it that surrounded the original cat cause me any problems?

Smokin

Greg... Very nice! You beat me to that one. If anyone else has one they'd like to sell... Please let me know.

pete000

Any weight savings?

FotoVeloce

I saved about 12 lb. doing the 'euro-cat', which is larger and probably heavier than that pipe.

Here is what mine looks like:

DrJupeman

I am no expert, but I suspect you will not have a problem without the heat shield. A standard cat operates by getting really really hot. Since this is a bypass, hot gases will travel along their merry way and simply heat up similar to the rest of the pipes.

Smokin

FotoVeloce... You seem to have a second bung welded on your pipe, behind the one for the 02 sensor... What's it for?

TR6

Unfortunately, I don't have a scale to weigh the two components to compare, but just holding them, the original cat feels massively heavy compared to the bypass pipe. The bypass is simply a pipe with an O2 sensor bung, a square flange welded on one end, and the flare on the other end to mate up with the donut at the primary muffler inlet pipe. Its what I've heard referred to as a "test pipe". Its very light. When I get a chance, I'll weigh the components (original and bypass) and post here.

I drove it again this morning and the sound just rocks! If I can figure out how to do it, I'll try to record a sound bite.

kgorman

It's not a Fabspeed. Perhaps a Dansk?

TR6

Here's a few pics of the cat bypass out of the car. I reinstalled the original cat this afternoon. The swap only takes about 30 minutes, so it doesn't look like it'll be a big deal to swap back and forth if needed.

wsybert

That's the one iI was supposed to get! I posted right after he put it on the site. omen340 right?
Oh well.... he said he would send a pic and never did, then told me he sold it.
Had to rant... would have loved to have it.
Anyone else that has one, still looking.
Bill

kboustani

any fuel smell with the cat bypass

flytech78

did the check engine light come on ?

Amroth

Does anybody know the brand of mine?

and does anybody know if there is a sound difference between the sound of Greg's slim pipe and this phatter one?

Amroth

Okay, maybe the angle of that photo is a bit stupid for identification...

Amroth

Slightly better