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hey guys i am having some problems with my 200sx s15, it is nearly all stock apart from exhaust, FMIC, and alloy radiator. it is coming onto boost extremely late around 4300-4500. you can hear it winding up before hand but honestly don't feel any type of boost till about the 4500 mark as i said. i have a few mates with s15's and s14's and when their cars were stockas they believe it was definitely coming onto boost with no lag what so ever and after taking my car for a drive they reckon something is definitely up. when installing the new radiator last night we tightened all the FMIC piping as well as blocking off 2 small broken nipple holes in the fmic piping as my car would get little shudders and nearly stall when dropping revs which we put down to boost/air leek, this did completely stop the shuddering problem but has done nothing to they laggy feeling of boost coming on. We also tried changing VCT solenoid because their wasn't a great deal of difference in the feel of the car after we disconnected the wires to the vct solenoid but after replacing the selonoid and hooking it all back up it was still the same. my VCT cam gear is a bit noisy and will be replacing quiet soon but have been told this shouldn't effect the performance of the car i was wondering before i go out and take my car to a mechanic and get them to find the problem via bloody hit and miss and lots of my cash, if anyone has any suggestions i should try out or if people have had similar problems?? thanks for any input people can give me as i don't have the cash for a mechanic to replace 10 things to finally work it what the problem was