IW STi Forum banner

Best place to buy killer b header?

4.5K views 22 replies 7 participants last post by  killerbmotorsport  
KB mate w stock exhaust. So any kit that can mate with stock will work, but I'd use different flanges .

Contact them . . .
 
owns 2020 Subaru STI
  • Like
Reactions: Karlot
Well I just spent some time looking through the archives, and found a couple posts on the fp red. It seems that it’s a give and take turbo. You give up a lot on the low end to make little up top. that is why many switch to a rotated setup. I wish I could get best of both worlds quick spool and that makes 550+whip without spending $15k. 6k for shortblock & 6k for rotated setup.
Uh, There is no choice of all the above. Pick one!


I am going to keep stock location turbo setup and go either with a blouch dom4 or fp black both in 8cm. polishEd housing.

why 8cm, because I drive mainly streets/ and time attacks on mountain roads. So I am hardly above 7k. Can I get to my goal of 500whp with my blouch that I have now, possibly but I can just feel it run out of air at the boost level, 24# ,I’m at. I already run e85, id1300 injectors, fmic. 3” down pipe and exhaust. I know I will pick up a lot from the header swap but just not enough..
I believe you'd pick up a lot more with a 10cm housing. Heck a 1.5xtr deserves a 10cm housing . . . That I can say from experience as I ran them for 75K street miles . . . Spooled like stock - and few of us want to generate tons of torque at or below 3k, at least not those of us with "faster" STIs that have been here a while . . .

OK. If you are serious about time attack perhaps you have to determine what you want. best response or more power . . . but at the power level you are discussing I suspect 8cm should be off the table. You will make more power at lower boost . . . 8k rpm- Uh no. Not without a valve train which do not have.
 
owns 2020 Subaru STI