just stick to the internal coiled 4e/5efe engines and you'll be fine. i learned the hard way with the fhe. the only thing you may want to consider is that even though the 5efe has more power i think it is a longer stroke engine than the 4e... so it will probably be a little less revvy than 4e, also ive heard that the gen2 paseo ecu has a slightly lower rev limit. i dont know for certian so i could be wrong!! the 5efe with fhe cams would be a nice upgrade, especially as you can get 4 to 1 performance exhaust manis for the 5e from ebay usa for £100 4 branch inlet mani, and that'll be a