Decided to go for the Genie headers. I have a EF11 XR6 auto with 90 000km on the clock. Never trashed. I went for the headers and 2.5" hiflow exhaust with a resonator with the original cat. have a K&N in the airbox.
No improvement in power at all after all that. Pre dyno 168Hp ?kw
post 170Hp. The guy reckons there was a pinging and it might be out ot tune. I will go and get it tune tomorrow. I still thought that should be something, not zero, zilch, nothing. I am pissed.
Sound ok with a some droning on accelerating.
He also recommended SS inductions cost $300. Too expensive.