Monza exhaust note!

[Rooster]

After having my trofeo for 9 months I have noticed a significant difference in the exhaust sound. For the first 20 mins of driving it’s nice and loud with pops and bangsas I shift gear. After 20 mins when engine is warm it tones down a lot and near impossible to make pop or bang, and a lot quieterIs this an indication that the valve is stuck? It’s bugging me a bit.  And if I chose to wire it open would it pop and bang in that case as well ?   Many thanks

[James King]

It's nothing to do with the valve, it's just the car warming up. Once mine's up to temperature I have to work REALLY hard to get a pop on upshifts, whereas if I go for it straight away while it's still cold it'll pop basically every time.

Just to note that running hard when cold is never really a good idea, especially on cars that are closer to tolerances like ours, in your daily runabout crapbox it doesn't really matter because they're designed and built with non-car people in mind, whereas performance-oriented models are a bit more sensitive to that sort of thing.

[rossocorsa]

Wire it open it sounds better and probably pops more often (rare though TBH) because the flap is always fully open. The noise at low speed is hardly any different really.

[Andy595]

Sounds to me like a job for an intercooler, although I have no experience or great knowledge of such, I have seen some posts on here regarding them!

Andy