I have a series 5 rx7 intercooler thats been enclosed for running w2a I used it on my rx7 for a while, not using it if youre interested.
I think I have a subaru water pump too that went with it.
The top is always the same as AE86, the bottom mount on the diff is different, you need to swap spring seat for the other KE70 model or AE85/6 mounts.
BC's are definately the Jam, never been a fan of HSD, they normally run really soft. BC make RCA's and theyre $120 from redline.
at 198kw, youre not maxing anything
but with proper exhaust it could, if you still have mufflers and stuff its probably still down on power.
Is it running 14psi+ with the new exhaust?
Possible, but I really doubt it, weve given these things the biggest beatings imaginable 120deg + still drifting etc and never once had a headgasket problem.
Do a compression test too, should be up around 175-180psi even.
And check fuel filter if you havnt.
With 1JZ, the right range heat plug is the wrong one!
BKR7E gapped to 27 thou will sort you out.
Might not be All of your probs, but will definately help.
People drift nissans because they think its too hard/impossible to drift anything else
Guy posting probably doesnt even own a car, so i dont think we need to worry about an 808 being crashed into a wall trying to drift.
Im just in to say that leaf springs are sweet!