Prochamber with cats? Does it exist??

astronut1885 · May 9, 2007

Hey guys. I had an o/r prochamber and flowpath catback on my 87, and it was the sexiest thing I ever heard. Now I have an 04, and I would love to put a prochamber on it, but I want to stay emissions legal and a little quieter this time around. I've looked, but I can't find a catted prochamber. Are they out there, or am I either stuck with an X or an o/r prochamber? Info would be great!

ACSPONY · May 9, 2007

Check 50Resto
http://50resto.com/products.aspx?category=M94MID3

astronut1885 · May 10, 2007

Dude, you are my hero!!!

astronut1885 · May 10, 2007

Ok, so, new question: If I were to install one of these, with stock style shorty headers, do I need MIL eliminators or 02 sensor extensions? Or is this a direct bolt-in for my '04? I searched, seems most people are talking about this with an o/r prochamber. I'm determined to stay totally legal with this car, and the noise reduction with cats over my old o/r model on my 302 is nice seeing as cops in my town are total douchebags... I still love the sound of a prochamber, I just don't want to rattle my neighbor's house anymore.

ACSPONY · May 10, 2007

I'd imagine that if it has cats, it's designed to be emissions friendly and you wouldn't need MIL Eliminators. I know Magnaflow's catted midpipes say they're emissions legal but I'd check with MAC just to be sure since the product description doesn't say anything about it.

astronut1885 · May 10, 2007

I'm still a 4.6 newbie. I'm guessing the rear 02s are downstream from the cats, and thereby are there to make sure the cats are doing their job. With an O/R pipe, they're not there and aren't filtering, so the rear 02s must register major issues with the computer. The MIL eliminator takes care of that I'm guessing. Now, with a catted aftermarket pipe, it should theoretically keep those sensors happy, although a higher flowrate of exhaust might still tick the little buggers off... Whatever happened to the days of straight pipes and carbeurators?? lol...

ACSPONY · May 10, 2007

Yeah, more flow might mess with the sensors, that's why I'd check with MAC before you dish out the dough

harrisonfiveo · May 10, 2007

Ive got the catted mac prochamber on my mach, and yes you do need the extenders for the o2sensors. The guys at mac told me no but i found out the hard way. I wish i had gotten the cat-less prochamber because i think its still too quiet...even with single chamber flows.

astronut1885 · May 10, 2007

Haha, your complaint is a blessing to me, I want the sound without the volume. I've had cops follow me home because they heard me coming in my 87. Quiet but nice is A-OK with me. Besides, I think I'll be backing it up with a SLP Loudmouth catback, so it'll be noisy...

Prochamber with cats? Does it exist??

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