What would be the most horsepower effective bolt ons to my 2.2 SOHV?
Having done just about all of them? None! LOL
Personally, if youre serious about making some power, start with getting a spare head and porting it. After that, open up the exhaust and intake.
I did Intake, Header, Exhaust, coils, wires, tune, pullies, motor mounts, etc. Porting the head and the header *felt* like the best gains. Never dyno'd it though. It is built and boosted now.
For the same money as all that you could get MOST of what you need for a low pressure turbo system. at 5psi on a stock motor i was doing WAY better than any bolt ons could do for me.
"A car just isn't a car without a little blood, sweat, and beers." -- Shadowfire