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DazzerVTR
18th December 2006, 22:45
Just out of intrest I currently have a Powerflow catback system, I was wondering what sort of BHP gain would I see out of a decat and 421 fanny?

It's a MK2 VTR with cat under car.
S34MER
18th December 2006, 23:06
dunno 3-4bhp maybe 5 IF your lucky! but thats only a guess, no-one will be able to tell you exactly!
KamRacing
19th December 2006, 00:08
you will get a gain but I'd hate to put a figure on it.

performance manifolds and cat bypass are good things
hesslevtr
19th December 2006, 13:07
get yourself a 4-1 manifold

dont be expecting miricales with them mods but will see a gain
Colin
19th December 2006, 13:56
I had a 13hp gain with a Raceland and a de-catted Powerflow.

I have prints to prove!

And its in Pgti mag this month, although the 103hp figure is at the FLYWHEEL!
VTS_16v_Boy
19th December 2006, 15:05
Thats the problem with doing one bit at a time, the gains from adding a bit at a time are always going to be small but changing the whole lot in one go would have seen the most difference in before and after.

Figures will vary between car to car but either of the performance manifolds and decat or sports cat is a good idea.