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Cat-Backs, what are they really worth HP wise?
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Posted by: 99FRC

Not mush I think. Any one have actual dyno numbers?

Posted by: GMR

Bought 10-15 HP on a stock car I think.

LS

Posted by: MadScientistMatt

Really depends on the car and the pipes you get. I've got an article where Grassroots Motorsports tested cat-backs on a Jetta - gains seemed to be from 1 to 4 hp depending on which one they went with. However, some of the first tests had been done with a manifold so restrictive that they couldn't get any power out of a cat-back, so they had to swap on a better manifold to get any results.

Posted by: VETTKLR

Quote:

Originally Posted by 99FRC


	Not mush I think. Any one have actual dyno numbers?

I know there are dynographs riddled through www.svtperformance.com showing improvements in exhaust systems.

The '03-04 Cobra's exhaust AND Air Inlet are super-restrictive to get the car through noise emission tests.

Swap out those two parts and you'll gain approx. 30 rwhp.

Posted by: IROC_ZO6

catbacks and CAI are netting about 30rwhp on the goats with tuning. throw LTs on there and your looking at 50hp for intake/headers/catback and a tune...

Posted by: KrautBurner

Quote:

Originally Posted by MadScientistMatt


	Really depends on the car and the pipes you get. I've got an article where Grassroots Motorsports tested cat-backs on a Jetta - gains seemed to be from 1 to 4 hp depending on which one they went with. However, some of the first tests had been done with a manifold so restrictive that they couldn't get any power out of a cat-back, so they had to swap on a better manifold to get any results.

the turbo back (Down pipe, cat, + cat back)
is worth 18-22 on the dyno on the 1.8T motor

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