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Message: <blockquote data-quote="wan syahmi" data-source="post: 379004" data-attributes="member: 15222"><p>MY EXPERIENCE...my car is 325 and have 4 cats..after remove all my cats , the tork and top end increase...but the problem is if i maintain certain speed which below 120kmh, the check light will appear...but after o2  ( after cats) sensor aku ubah kebelakang about  3 kaki, the problem solve..the piping i change to single piping 2.3 inch with ac snizer muffler, the sound is very similar to r34. before, my piping is 2.5, my car get 250kmh very fast, but very low tork at low rpm. and my advise, the most important to mod is tuning.,no mather ure reflash, using safc or any piggyback device. at my last dyno my car got 203hp on wheel, cheers..</p></blockquote><p></p>