I found for HR that exhaust manifolds, long tube cai, custom exhaust & hfc gave a really nice gain bhp wise...But from a drivers perspective, the cams (also Tomei’s 10mm lift) helped the power curve, paired with the JWT light weight clutch upgrade it now drives amazing and I’d say that they (and poly bushes) have been the best mods I’ve done so far as have made the car so much nicer to drive.. also just upgraded suspension which has made it feel awesome!
Completely agree with 350Butcher on the numbers side of things. I’ve spent ££££ on it now, especially as I don’t have a garage and have to rely on my mechanic more than I’d like... if you can do the engine work yourself you’ll save loads!
By now I’d of paid most of FI build off but I wanted to keep NA for now at least. if you want 400bhp you will have to FI.. I got 347 but will need to throw loads more at it to increase it now.
Also, if you’re doing the cams you should replace the other acillarys & (gallery) gaskets too.