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Message: <blockquote data-quote="E34EuroTouring" data-source="post: 70533" data-attributes="member: 1026">Your car has M20 engine with SOHC but it revs quite well for an engine that age. Doing port and polish will give you better top-end but sacrifice lower end torque.This means up to 4000 rpm there is little else happening. From 4000 rpm to 6500 rpm, there is a quick rush, so fast that you will struggle to shift fast if its a manual. For auto, it will shift at 6000 rpm or a little more depending on the load of your car.If your head is going to be out to change the head gasket, its a good time to do it. Get the valves adjusted as well since that will improve the FC and give better smoothness. I got valve angle job done by mech but polish the intake manifold myself using Metric Mechanic charts. My M20 revs better than an M50.To cure low-end torque problem, I had 535 AFM fitted with Apexi SAFC-II controlling it. Torque comes about 3200 rpm rather than 4000 rpm. It has K&N cone with custom headshield, intake noise louder from 4000 rpm and above, must my noisy exhaust drowns that noise.</blockquote>