If you want efficiency of your engine to maximize your bolt on power that you bought with your hard earned money. Maybe you should look into having your cylinder head PnP. We all change the exhaust/intake size but what about the cylinder head port?  We  perform cylinder head port and polish including combustion chamber work that is proven time and time again to produce significant gains on flow efficiency. Our engines have shown an improvement on top end power especially when combined with the appropriate camshaft. We feel that top end power is always important especially on 4 cylinder engines,  turbocharged or normally aspirated. Afterall this is where the racng mostly occurs. This can be done tailored according to your engine set up such as size of turbo/exhaust,  displacement, compression, etc. Generally there are 2 types of set up we do. Either street or racing set up. Street is best for combined daily driving and racing. Racing is for track use only that would require the high rpm power. Will suffer if used on street driving. The ej20/25 cylinder heads due to its design will significantly gain from proper porting and polishing. The 4g63 particularly evo8 has an excellent frame already to work on and will benefit significantly with the proper PnP. The combustion chamber massaging that we do enables you to raise turbo pressure with lesser chance of detonation compared to stock therefore more power. Other cylinder head that we normally work on Honda B16/18 and Toyota 4ag/3sg heads.

Andrew doing some more work on the intake port  of our cylinder head in preparation for the stage2 EJ20 S&S Autoconcepts engine

ej20 cylinder head exhaust port

    Available on USDM Subaru wrx/sti and Mitsubishi evo cylinder heads. It is basically divided into 2
stages. Stage1 is mainly just to improve the flow on your cylinder head. No significant structural changes
needed to be made. Will usually not need any valve job unless new valves/guides need to be installed. The
gain normally is all throughout the power band. This requires about 10 hours of work including preparation.
Price for this is $300.00. Additional charge if machine shop service needed such as resurfacing, valve job,
etc. Stage 2 port and polish is our racing spec. This will really shift the power of your vehicle on the upper
end of the power spectrum. Definitely requires a competition valve job because a new set of valves/guides
required and to maximize potential. Labor price is $600.00. Additional fee needed for parts and machining
service

      note: this charges are applicable only on cylinder heads that are removed. Additional charges required if
removal/installation of head needed on the vehicle.