will these mods be ok?

[L12A GN]

right i know you can hit some problem by fitting catback ,MP and DP with a stock ecu n would need apexi PFC

but could i fit a hks DP and catback n be fine?

will i see and increase in performance? noise?

[Devil\'s Refugee]

Still think you would need the FC to take advantage, not an expert but fuelling may be off slightly (rich/ lean, don\'t know which way) ??

If the mid-pipe/cat is stock, then you\'ll probably not realise the full potential with this restriction. Certainly be noisier for sure, very noisy with a straight through mid-pipe with no cat. I\'ve got a Knightsport hiflow cat pipe which will save me at MoT time.

[mikeyh]

devil come see me at mot time i know a very nice tester

[Devil\'s Refugee]

Will do mate, won\'t be till this time next year but will keep it in mind