LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

how much hp running no cats

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Old 02-26-2003, 09:44 PM
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how much hp running no cats

i removing my cat tomorrow i was just wondering if anybody actually knows the horsepower difference i have headers and flowmaster??? any help is apreciated,thanx
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Old 02-26-2003, 09:49 PM
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I've heard anywhere from 5-20... I hate how there's so much confusion about stuff like that.
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Old 02-26-2003, 09:51 PM
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dyyyno dyyyno dyyyno!
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Old 02-27-2003, 12:13 AM
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it was more than when i did exhaust, cai, and lt4 km all together after i took off the flowmaster and put on a dynomax quietflow. the 3" flow sounded terrible and i had no low end. it was loud as hell kinda like a ragged out old truck. there was no backpressure and with the bolt ons it hurt me big time. the car jumped at like 4800 rpm and pulled up to 6000 but by that time it was to late. some have experienced this and others have not but a buddy of mine said the best exhaust he had was with no cat and the stock muffler. good luck.
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Old 02-27-2003, 12:37 AM
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I think it's 5-10ish, but im not really sure, but its gonna sound really really loud
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Old 02-27-2003, 12:40 AM
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You won't gain much if any at all.
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Old 02-27-2003, 12:47 AM
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It's a broad range because all the cars are so broad in what has been done with modifications. Like gains from a highly boosted motor versus no gains from a totally stock motor is very different with no cats.

If my car is not modded much, I would not bother with this. But if you have time, like the sound, and think you needed to make your exhaust flow more, then it maybe good. Remember some backpressure is needed for low end.

cheers
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Old 02-27-2003, 01:28 AM
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Personaly its not worth the trouble just to be louder, the power gains aren't that much to deal with the other down sides to it, mainly you living in California.

Loud Car = Trouble
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Old 02-27-2003, 06:40 AM
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I can VERIFY that I gained a dyno proven 7 RWHP by going with a straight-piped convertor and a Borla Y-pipe.

- Brent
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