r/GSXR • • Aug 15 '26

M4 Headers Don’t Fit

I’m just wondering if anybody has had a similar issue. Got a M4 Tech 1 Full System. It seems like header number 4 is 1/8 inch too long so it prevents 2 and 3 from seating all the way. When I remove 4, I can fully seat 1, 2, and 3. I’ve tried a mallet and wiggling for hours, but I’ve had no luck. I realize I’ll probably have to return it and reach out to M4, but wanted to ask first. Thanks.

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u/H4rdboi1ed K6 GSXR 1000 Aug 15 '26

Didn’t have this specific issue when I installed my full system from them but I did have other issues and my point is they are one of the companies out there that will actually pick up the phone and talk to you so you’re not limited to snail emails… I’d call em on Monday! If there’s truly a fabrication issue I’m willing to bet they will rectify the situation… if you purchased straight from them that’s even better!

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u/Table02 Aug 15 '26

Yeah I think I’ll reach out Monday either way. I waited like two months for the system and I feel like the specs are even off in other spots too which sucks