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Discussion Starter · #1 ·
Hi I recently bought a z650(in the uk) and it has a sp engineering full system fitted and has been remapped to suit.
Problem is it sounds brilliant but is too loud for me !
Will putting the stock exhaust back have any affect on the ecu flash???
Regards Rob
 

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Hey Rob - usually putting on a full aftermarket exhaust makes the bike run too lean, so tunes compensate by making the af ratio more rich in the spots where it becomes too lean. Removing the exhaust and not going back to stock tune MAY make the bike run too rich, but honestly, these bikes out of the factory run quite lean already so I don't know whether running a little more rich would cause you any problems.

If you do decide to remove the exhaust let me know if you're interested in selling it -- I've been contemplating getting an aftermarket exhaust, but dont really want to spend too much money on one..
 

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Agreed.
If you do plan to revert, best have a tune accompany it as well!

Let us know what you decide to do : )
 
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