Removing back box/muffler
 

Hi. I’ve acquired some new tailpipes manufactured by a reputable UK company which they’ve been supplying for the 370z for about 7 years. I’ve a 2017 MT. Customer reviews of the pipes are very good. However, reading generally around the subject I’ve seen suggestions that dispensing with the back box/muffler can throw the ECU out and long-term lead to exhaust valves burning out due to the engine running with a consistently lean mixture.

Does this sound at all likely? I’d have thought a modern fuel-injected engine would automatically adjust the mixture to ensure correct petrol/air mix. Any/all responses appreciated.

Cheers

I've never heard of that explanation before. Whether it's true or not, someone would have to do an actual test.

However, muffler delete is a 'common' mod on the internet.

What WILL happen, however, is that you'll end up with drone that will drive you crazy. Trying to mess with the sound in these cars is like opening a can of worms. Either do it for performance reasons or just get an cat-back system with helmholtz resonator design that was created to fight drone, or just leave it alone.

That is false.

I've been on this forum since it's creation and I have never heard anything about a muffler delete causing an issue like this. Sounds like fake news to me.

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Thanks all for the feedback guys, much appreciated

Max

That's some crazy UK hearsay Mate! :wtf::shakes head:

Used to be that way with carbs some what. Sometimes you had to rejet them. It was a PITA rejetting dual 850 Holleys.

Completely agree! I have been through numerous mods including muffler deletes to full catback systems. Drone was horrible, especially at wide open throttle. This is especially true with coupes due to the rear hatch area acting like a speaker chamber.