So my mate's got an ek4 like mine and his ecu limits at 6000 rpm whereas mine ( both standard ) 8400rpm. i put my ecu in his car and it was fine 8400 limit.

My question is can any b16a ecu like from a delsol or eg6 be put into his ek4 to get higher revs again or does it need to be an ek4 ecu because of the wiring?

I saw a delsol ecu for sale and was thinking it would be ok to buy it since its the same engine b16a2.
If a del sol or eg6 limits somewhere around 8k or 7.8k thats fine as long as it gets pass the 6k mark and allows vtec to engage properly.

Any help would be great thanks