I wouldn't recommend Bosch plugs on our cars. The extra tip that yours has just gets in the way and doesn't provide a full burn of the fuel in the combustion chamber like regular spark plugs do. I ran platinum 4's in an old car of mine for a short amount of time. IMHO stick with NGK plugs or a...
Doing a little searched came up with these numbers for another brand spring for the supra
RS_R Down Springs have 503 ft/lbs in the front and 262 ft/lbs in the rear. IOW, this is a little stiffer than the stockers...
Suspense Techniques Sport springs claim a 10-15% increase in spring rates...
Remove the restrictions in your intake system. It's a turbo car. Turbo cars have turbo lad ;) (shitty power until boost). Filter, hardpipes, IC, full 3" or larger exhaust. Post back about throttle response after that ;).
I've seen pics of a few guys who, through some hard work, have relocated all of thier electronics and sensors and shit that aren't directly connected/bolted onto the engine out of the engine bay. That would help in better distributing the wieght, not to mention making the engine bay look like...
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