HP loss with adding cats?
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From: Lee County, VA
HP loss with adding cats? i just bought a H/C camaro with an OFY but im gonna have to get a TSP catted-Y to pass inspection in my state....so how much HP am i lookin to lose from this swap?
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From: Philly
another "how much hp will i lose by adding cats" thread 
there's only like, what, ten thousand of these? ugh.
you won't lose much. your best bet is to take the ORY that you have now and weld in magnaflow metal brick cats in. you may lose 1-3 horsepower with them, they flow so well, and i hear they have nearly NO effect on sound loudness, but they still get rid of the rasp and help your tone.
don't get the TSP ORY. get the cats and weld in your own. the magnaflows are bullet cats barely an inch or two thicker than the actual pipe. no use for the big clunky cats (by comparison) on the TSP y-pipe.
there's only like, what, ten thousand of these? ugh.you won't lose much. your best bet is to take the ORY that you have now and weld in magnaflow metal brick cats in. you may lose 1-3 horsepower with them, they flow so well, and i hear they have nearly NO effect on sound loudness, but they still get rid of the rasp and help your tone.
don't get the TSP ORY. get the cats and weld in your own. the magnaflows are bullet cats barely an inch or two thicker than the actual pipe. no use for the big clunky cats (by comparison) on the TSP y-pipe.
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I lost about 14RWHP with cats on my 385. That said I still went almost 128mph in the quarter at ~3650 plus pounds raceweight through cats with the six speed, full interior etc 
I'd run them to prevent the stench/rasp. Plus it's pretty cool to go fast with cats on the car imo
I'd run them to prevent the stench/rasp. Plus it's pretty cool to go fast with cats on the car imo
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From: Philly
Originally Posted by SVThis
tsp Y is already ordered so too late for that...but the cats on the TSP IS magnaflow cats
with the metallic core cats you'd be looking at 5rwhp or less loss i would guess. with the ceramics you're getting, it's more like a 10rwhp-15rwhp loss.
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I plan on putting cats on my ride, right now I have Mac-Mids w/ ORY and Hooker Cat-back, I plan on getting some Long-tubes and catted Y. Would you guess this to be around the same HP? Will it lower the nasty exhaust smell? I just hate stop and go traffic and smelling bad when I get out of my car. Am I just stupid? =D
