whats up everyone so i just got my first evo and when i bouth it the exhaust was bent so i cut it off right after the downpipe, running like this for a week the bov and turbo sounded awesome very loud, even the wastegate witch is vented to atmosphere was louder then **** when it opened. well today i installed the megan catback and now the car is super quiet the bov mostly flutters etc. why is this im just curious??? its kinda dissapointing

 

Its quiet because you installed the cat back, get a cut out if you want it really loud.

 

Ok ya i get that i guess the question i was looking for is with a cat-back on now why would that affect the bov from a gunshot to a gay flutter? Back pressure affecting the boost??? It might possibly be a recirc ill have to look! it sucks

 

Isn't fluttering usually associated with compressor surge? I remember when I had my old SRT-4, if I went into part throttle boost (PTB), it'd flutter as a sign of compressor surge, which is really bad for the life of the turbo.

 

ya i heard that but it only started doing it since ive put my cat-back on???? i wonder if i need to get a new bov spring i might just rip the gay exhaust off again its buggin the **** outta me

 

If you get a harder spring for the bov its gonna be harder to open, what kind of bov do you have(brand)vta or recir ? I had a Greddy type rs I tried tunning it many times with no success and after i bought my Tial Qr it went away almost completely. Compressor surge is normal, what you need to worry is surge at Wot.

 

Now to answear your Q, the exhaust is not gonna affect how the bov sounds maybe it was fluttering before but since the exhaust was louder cause you didnt have one you didnt noticed it, the only way you can hear the fluttering louder is if you have an intake conical filter. Backpressure can only affect turbo spool at a certain point.

 

U know i didnt really think bout that i have i tial q! That is a very valid point i just wasnt hearing the flutter n it only flutters at ptb not at wot it actually blows off i hope its not compresser surge beating the **** outta my gt4088r