hey coheed, please dont do both changes (grinding backhousing and changing cams) at the same time before dyno-testing. It would be very interresting to see the effect of the 20v cam alone.
I used to grind down some material on my garrett gt3271 long time ago to reduce backpressure and it had no positive effect on power or knock but very bad effect on the spoolup. So finally i bought another new backhousing and threw away the grinded one....
I used to grind down some material on my garrett gt3271 long time ago to reduce backpressure and it had no positive effect on power or knock but very bad effect on the spoolup. So finally i bought another new backhousing and threw away the grinded one....