Hey guys I just put on my brand new exhaust a week ago. When I first installed it it sounds AMAZING it's loud and has this high pitch scream but now its gone.... It's not as loud and the music's deeper........ Is this normal?? I tried to find any exhaust leak but couldn't find any unless it's the header...... Did your AP exhaust gets deeper and quieter after 1000 miles??
thanks in advance

 

All exhaust will change in tone after a bit. The pipes get coated and the mufflers "break in". It's normal.

 

Ya I know they change but it didnt change that much on my last exhaust....

 

unless its an exhaust leak u are describing then yes its most likely normal. your last exhaust could have had different muffler packing

 

Maybe it's cuz my exhaust hit something and now its not aligned? Also does it matter which gasket i use after the y pipe? The one came with the stillen y pipe or the one came with ap??

 

nope doesn't matter. are you running test pipes or high flow cats??

 

Im running hfc

 

when you get down the sound is amazing with tp or hfc. thats what makes this exhaust so different. not sure what ya lost in sound but its still a worthy exhaust.

 

ya it sounds amazing when i got it. I think I got bad gaskets before the cats, well see on monday lol

 

Hmmmm so it's not the gaskets.... Anyone got any ideas??

What can it be if I get hissing sound when I'm driving and let off the gas while the car's still in gear and also the exhaust got quieter??

 

i have a hissing sound after i installed my aam ypipe and motordyne art pipes, checked for exhaust leaks and found nothing. i think im going to go with the motordyne xyz pipe though.

 

the hiss is normal with hfc and tp's

 

Well I didn't have the hissing sound till now. I went to the shop today and apparently my manifold/header's cracked...... Idk if I should just replace it or get the aftermarket ones lol

 

wow thats the first i have heard of a manifold cracking on our cars. not saying it hasn't happened just the first. go with stillens.

 

Ya I never heard of it too. I googled and searched the forum bout exhaust manifold cracking and found nothing....... Ima bring it to another shop to make sure if it's rly the manifold...... Why stillen? I'm trying to figure out if I should just replace one manifold or just get headers. Manifold cost a lil bit less than 300+3hours labor and header costs like 500-1200? + 6 hours labor.... That's a huge diff and after searching the forum it seems like header doesn't provide any gains and can lose some power sometimes........... Mang this is hard lol

 

agency power exhaust is sexy!

 

YUP it is but not when my manifold's leaking.....

 

OK..... just got my DC header installed but it still sounds weird lol.... Ima check if my hfc are breaking inside next.... Hopefully I'll find something...

 

If the HFC were going out then you would notice a big drop in performance