I tested compression after a breakdown and had been sitting for quite some time. Results not perfect... #1: 145 #2: 145 #3: 125 #4: 140 #5: 135 #6: 150 I've only just started driving it again. (Strictly weekends) So, I'd like to test again to see if they've changed at all, but might be moot as I've been lead to believe it needs a rebuild anyway... Just for a baseline, it has: stock auto turbos - 15psi stock fuel system larger side mount intercoolers 3" stainless exhaust + hi flow cats (I want to replace) nistune, turbosmart boost controller, turbosmart recirc valves twin pod filters (might downsize to single or stock airbox) lightened chrome molly flywheel, balanced ally front pulley, ally prop shaft ceramic clutch, rebuilt transmission, ally radiator So the question is, when the time comes, what's worth upgrading? What sort of modern turbos out there? I see people can squeeze larger turbos with aftermarket engine mounts? Any mandatory head work? (oversize valves, porting?) forged pistons? rods + crank? Worth going to ethanol? I assume would require new ecu + complete fuel system $$$ Getting carried away / diminishing returns? I assume there is a popular sweetspot for budget mods?