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1999/2017 RSTI
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225 Posts
upgrading the EJ25 heads is probably the best for ease of modding and higher hp... i wanted the STI heads those sodium filled valves are so tempting... but have decided that changing the heads requires way too much work (changing ECU and wiring harness etc) just upgrade the heads...
 

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17 Posts
Discussion Starter · #4 ·
I will use the 2.0l heads because one i got them and not the 2.5s and second because then engine i got had bent valves and they were replaced with heavy duty ones. heads are being port and polished as well.
 

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'00 2.5RS coupe (9/01-1/04)
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236 Posts
Cobb Tuning made a hybrid engine: USDM EJ20 turbo heads + a built EJ25 bottom end. It was on the i-club about a year ago, maybe a little more. Good luck finding it, but it was a cool thread.

-s-
 
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