what do i do to upgrade the ECU, how is this done. Also my friend has a S-10 truck. he got a chip for it, and it is faster than jesus him self... when he takes it out its nothin. A'PEXi AVC-R Boost Controller, <- what does that do. Is it for turbos only. And do they have any chips as well. Dont know why this is all confusing me. im new to this world of speed. I am big into like jeeps and stuff like that. But this nissan is kind of confusing. 1 more question. I ordered the RP Nippon stainless steel N1 style muffler RP 240SX DOHC intake system. Are these good. I would hope so its to late now.  the next upgrade is going to be like ecu or somting.. whenever i find out what is it.
Sorry for the mouth full
Ian