Thanks for your input mate:-)
However problem am at the moment is yesterday we took off oem downpipes and the guy only gutted one of the plates as they have two plates on each cat thats the oem ones, he said if you take both it would be too loud, atm i am with one plate gutted of oem cats and resonator stock and rear boxes are completely gutted out and valves always open, it sounds nice with no drone at all but i am after some pops and crackles and thats why i intend to go down the oem downpipe gutting, been told that oem downpipe apparently there is no wastegate rattle as the oem cats are thick which means u can barely or none at all any wastegate!
I hope am not confussing you lol but my main goal is to add more pops and crackles, so the question is:::
If I completely gutt the oem cats will that increase alot in noise? Wastegate? And mos inportanly pops and crackles?
Or do i have to leave main cats as they are and cut out resonator?
Or gut completely main cats and cut out resonator so pretty much end up with comple straight through system all the way?
Quote:
Originally Posted by Whipple
I will give you my experience with wastegate rattle form what I know,
My car in stock form has zero wastegate rattle ,I know what it is and I know what to listen for and know what it sounds like,So I first installed a Full Meistershaft GTC exhaust with stock catted downpipes, that means from the downpipes all the way to the mufflers the piping was replaced to 3.5 pipe with a velocity box in the middle section ,when I installed just those pipes I started to hear the rattle,I can only hear it if I was next to my house revving it up and down but heard it very slightly.I think just the larger pipe made it more audible even with the cats in.
Later I installed it with the catless downpipes and that was a game changer on how loud the car got the cold start was insane and my neighbors hated me.
The wastegate rattle I can hear loud and clear , it rattles a little right before you come to a stop and thats it ,it doesn't bother me at all,I know its a normal thing for the car,Later I had the car tuned to get rid of the cold start and it great now.
With the tune and exhaust the car sounds insane I get a small burble on deceleration, the cracks and pops are on another level sometimes it sound like a small explosion from the rear of the car and the whistle from the turbos its great its so worth it !
In the interior its not loud at all ,turbos themselves actually act like a muffler so at low idle and slow cruising speeds it actually quiet ,around 2k I do get some drone but its not a bad drone there are different levels of drone,also some people are more sensitive to drone than others,I can take my wife in the car and there is no complaining then its not that bad lol ,I also have the electric valves to make it quiet but I rarely use it
If I was you to get the best out of stock exhaust ,if it has a ZCP exhaust the front resonators are hollow already so there is nothing to clean out , I would of left the exhaust stock and just installed catless downpipes and kept my stock catted pipes for when you want to go back to stock ,if you have a non comp exhaust cut out the front resonators and straight pipe them, the catless pipes will make a world of difference with stock exhaust
Dont forget you can install a exhaust meister valve controller it hooks up to your vacuum lines in the trunk ,this way you can control your factory valves with a remote or via the garage door opener if its to loud you can just close them when you need it .  |