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Discussion Starter · #1 ·
Hi guys, new to the forum so forgive any silly questions...

I have an entirely stock trx400x and have put on a fmf powerbomb header and slip on, along with a k&n air filter. It runs fine with a noticeable power increase but I’m slightly nervous about the air pressure change on intake and back pressure.

Is there any further tuning needed such as jetting in order to ensure the bike isn’t running lean? As I said it runs great with no dead spots or misfires although the header pipe does begin to glow if idling for more than a minute
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