Quote:
Originally Posted by Acc
They may post it up later with their own write up....
When they first dyno'd the car with a K&N filter with stock exhaust it was 178HP. Today with the Hi-Power it was only 176HP....yes, a loss...but then when they first dyno'd the car it was about 2 months ago(its on the forum here some where...i ll try to find it)....so they put back the stock exhaust and dyno'd again it came out to only a 2 HP gain from the stock to HKS Hi-Power Spec-L. Changed filters from K%N, HKS Hybrid and OEM(little/no difference)
Lots of other exhaust companies seem to boast a 5-10 HP gain....but some I seen with dyno charts were done in 3rd or 4th gear....5th gear is where the 1:1 ratio is for the FRS/BRZ....
So in my opnion...without doing the entire exhaust system and or tuning there won't be a much of a huge gain in power...
But it does sound nice =] Hopefully a sound clip will be up as well.
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The big gains come from removing the CAT's after the header. Most of the exhausts making over 10whp are header back. You are not going to see much gains from a cat back. The midpipe does not gain anything, and the muffler repalcements are only seeing around 2 whp.