Hey Ive just seen this thread and wanted to share some experience. I have a A14 Turbo at the moment and just built a fully worked efi motor. I started with a 350 Holley blow through set-up with WRX TD04 Turbo and 10psi. the sound was unreal and i was happy with the power. Only the head and manifolds were worked + electronic dizzy and copper head gasket. As far as i knew the bottom end was standard with low kms. (when i pulled down the motor i discovered they were 1500 pistons)

What i found was it was rough, cough one day, stall at the lights the next then run smooth the next time. When i got sick of doing that, I hunted down an A Series EFI Manifold and got it with aftermarket computer. What a difference it made!!

It didnt sound as good as the Holley but when it boosted you couldnt hear the motor anymore anyway. It made it smooth and consistant power and reliable to drive. i got the handset to make a few adjustments and on the dyno she went. i got 100Kw around 132hp atw.

That was 2 years ago, before xmas last year i had damaged a piston ring and thought time for a rebuild. This time i had a set of oversize 1500 semi forged pistons fitted with a balanced bottom end stage 2 turbo re-gound camshadft and oversize head studs. With a little more boost im hoping for around the 180hp. Just running it in now.

If your looking for a set of E15Turbo pistons drop me a PM i have a new set with rings available. Iam still a fan of webbers (i always will be) But unless you know a old school mechanic or know how to do it yourself i would recommend efi.It stays tuned and more power too.My manifold, injectors, loom and elec dizzy was off an A series and i paid $2000 for the lot.

Hope this info helps