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thats exactly the reason why i want the original Maserati QP Sport GT S one..... (i like the sound of the Larini also but they lack of homologation was the main reason (besides keeping everything stock maserati) to opt for the Maserati one.....

Thank you! I will PM you in a minute but is that just a standard ON / OFF procedure to have the valve permanently OPEN / CLOSED or will this also affect the way they work under load?

sorry again..... i own a Maserati QP S 4,7L that i want to upgrade to the QP Sport GT S - from this car i now got the oval mufflers with the Valves.... Hope its more clear now.... sorry ;)

sorry there might have been a misunderstanding - i didnt mean the GTS i actually meant the QP Sport GT S... my mistake

Hi, as far as i was told the difference between the S and the GTS exhaust only starts after the middle section. Since i have bought exactly that part it should fit in my mind.....

Hi Guys, Managed to find myself a pair of used QP Sport GT S mufflers for upgrading my QP V 4,7S. Now here is the big question. Since my QP S 4,7 didnt have the valved mufflers its a bit tricky to make them work as it was delivered from Maserati... So my question is how can the valve mufflers...

found myself a pair of used ones ;) thanks a lot!!!!

thanks for the reply..... i just keep on trying / praying / hoping then ;)

Hi Guys, I am looking for a QP M139 Sport GT S Exhaust (Muffler with Valve) - looking to upgrade mine on my 4,7S 2011 QP. Thanks Fred