Quote:
Originally Posted by regal
You will have to prove that adding any header with a crap tune is worthwile, I just don't see it. The key to a header tune is adjusting the vvt and spark and fuel profiles to eliminate the torque dip which is there in the OEM calib in part to deal with the manifold cat. Thestock ECU does not "learn" new vvt profiles. It also can't reduce the egr savaging.
Unfortunately its best to save for a header and a well matched tune. I think of this as a package.
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For the dip, yes, I agree.
For peak power there is a gain without a tune.
We've seen a 15 hp increase at 6000rpm and 11 hp of peak power with catless headers and HFC front pipe.
Then with a specific map made by a Ecutek master tuner here in Italy the car gained ad additional 9 hp of peak power, 218 hp against 198 stock.
The dip is gone obviously.