Why not just one cat?
Why not just one cat? Would anyone have an objection to just putting one cat in the i pipe? 
I just havn't seen anyone do this. My set up idea includes edelbrock victor series headers and edelbrock y pipe, modified for dual electric cutouts, then through a very large high flow cat, then through a borla xr-1 bullet muffler, then through my edelbrock catback.
Not looking for serious horsepower when the cutouts are closed, just to be quiet, no rasp and no drone, and no smelly exhaust. I'm going to run the cutouts open when I race.
Thanks
I just havn't seen anyone do this. My set up idea includes edelbrock victor series headers and edelbrock y pipe, modified for dual electric cutouts, then through a very large high flow cat, then through a borla xr-1 bullet muffler, then through my edelbrock catback. Not looking for serious horsepower when the cutouts are closed, just to be quiet, no rasp and no drone, and no smelly exhaust. I'm going to run the cutouts open when I race.
Thanks
I know for some states its illegal to change the location of the cats and putting headers on does that so your already illegal by way of fine print, but I think a mom and pop shop would pass it on inspection, and a muffler shop might touch the car. Magnaflow makes a little short cat that is capable of handling the flow of 378 cubic inchs.
So how much power is there to be lost?
So how much power is there to be lost?
I thought about this too, if there is too much rasp when I get my LT/ORY installed.
As for not having smelly exhaust, I wonder if the cat would get hot enough that far back to burn that stuff off...
As for not having smelly exhaust, I wonder if the cat would get hot enough that far back to burn that stuff off...
Trending Topics
So would yall say scrap the single cat idea and just put a bullet muffler in the I pipe?
I'm pretty sure the cat would do the same thing as the bullet but be more legal than not having a cat at all. It may not peform the best farther back, but I'm not worried about it doing its job, just quiet down the rasp and not land me a huge fine if I get pulled over.
Anyone ever been fined for having cutouts before the cat?
I'm pretty sure the cat would do the same thing as the bullet but be more legal than not having a cat at all. It may not peform the best farther back, but I'm not worried about it doing its job, just quiet down the rasp and not land me a huge fine if I get pulled over.
Anyone ever been fined for having cutouts before the cat?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Staging Lane
Joined: Oct 2007
Posts: 53
Likes: 0
From: Stoney Creek, Ontario, Canada
Converter should light up fine behind the y-pipe. We have had to put them almost 3 feet away from the header collectors on some 4x4's we have done and still had them pass emmisions no problem
TECH Senior Member
iTrader: (1)
Joined: Apr 2005
Posts: 8,807
Likes: 0
From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
been thinkin about putting a cat in the i pipe also, mainly for a cleaner sound (less rasp) but if it helped get rid of the gas smell I wouldnt complain. my car is lowered and iv been looking around at cats that wont kill the small amount of clearance i have. Would one small cat in the i pipe kill flow to where i would notice it, since its trying to force both banks through one cat instead of two?? whadya guys think about these, inexpensive and tiny!
http://cgi.ebay.com/ebaymotors/Unive...3756.m20.l1116
http://cgi.ebay.com/ebaymotors/Unive...3756.m20.l1116
Ok so after reading the sticky I and the way I understand it is that a single cat that is oversize in diameter from the pipe it connects to can act as a resonator, terminating the pressure wave if it is at the correct tuned length, therefore no loss of horsepower, and a gain of torque.
questions:
How do you determine the tuned length for the cat (resonator), after the y?
Bassically the two lengths of the y act as the first second length before the merge (not very controllable), the first tuned length being the collector. But is it still possible to place the cat at an optimal distance after the y merges to terminate the pressure wave, gain torque, cutdown on noise?
Will running through an edelbrock catback after the cat rob hp, what are the cfm flow numbers for an single edelbrock?
questions:
How do you determine the tuned length for the cat (resonator), after the y?
Bassically the two lengths of the y act as the first second length before the merge (not very controllable), the first tuned length being the collector. But is it still possible to place the cat at an optimal distance after the y merges to terminate the pressure wave, gain torque, cutdown on noise?
Will running through an edelbrock catback after the cat rob hp, what are the cfm flow numbers for an single edelbrock?
Teching In
Joined: Jul 2006
Posts: 3
Likes: 0
I have an LS1 out of a 2000 camero in my 89 Rx7 and to get an inspection sticker in Massachusetts I had the stock LS1 running together into a single cat, putting both post cat 02 sensors behind the single cat. The car runs great and passed the emissions test for an 89 Rx7.
After the cat it Y's out to two borla mufflers. The car is REDICULOUSLY quiet and still puts 289hp & 290tq to the ground.
After the cat it Y's out to two borla mufflers. The car is REDICULOUSLY quiet and still puts 289hp & 290tq to the ground.