is the catted dp louder then stock? also, how much more power will i get with the helix un-catted dp over the catted? thanx! and when i mean loud, i mean in what way? turbo or exhaust

 

Yes having a catted DP will be louder than stock. I have the SPT catback and it definitely got louder with the Helix catted DP installed. Even the uppipe gave it a bit more of a growl(did this a couple weeks before the dp went in). Nothing too serious, its pretty much exactly as loud as I want it. Not sure how the stock exhaust sounds with a catted dp. I've read you'll lose anywhere from 5-10 hp having a cat in there vs not having one.

 

I am not sure about 5-10, i would think you would only lose like 2-4 hp because the high flow cat is not that restrictive. I have a helix catted dp with a gutted uppipe and a stock catback. Rightnow it is really lout in the cabin with a lot of rumble but the thing is i dont have the o2 sensor in yet. I get it in today so i will post how it sounds when it is all fixed. But no mater what catback you have, when you add a dp with or without cat it will be louder than stock but usually it is just loud in the cabin and not outside.

 

i have helix dn pipe withe greedy evo 2 cat back but gutted the cat because the hunybee somehow droped in the canester of the cat. but anyway it got louder but midrange its really nice rumble from turbo all the way to the back with some deep in it. i like it.

 

Ohh nice.... a person doing what i'm thinking about, up/catted dp and stock exhuast =) can u get a sound recording if u can? THANX!

also, is the helix dp hella loader then the catted one?

 

ok here is the deal, i got my car done today and the sound is not very much different from stock. I do not hear that boxxer rumble or anything, not even at wot. all i hear is my turbo spooling up so fast it makes my ears hurt. THe exhaust is not that loud but with a gutted uppipe, helix catted dp, and a perrin sr intake you can hear the turbo spool from 4 blocks away. I was a little dissapointed that the exhaust did not sound that great but i got over it when i heard the turbo. Once i get my catback it should be a lot louder.
Ryan

 

oh sweet THANX FOR THE DETAILS!!!... now its time to make my car sound like a jet! then i'll get a catback to make it sound like some american thunder ehehhe

 

when you get your catback PM me and tell me which one you got and how it sounds. I am very uncertain of which catback i want to go with. I really like perrin products but i heard that they are extremely loud which i could care less about but i dont want my parents to know that i am building a speed machine!!

 

i'm thinking greddy evo2.... but i really wish borla made the hush with a single tip... because their single tip looks like the stocker on my car...

 

http://www.turbomagazine.com/tech/0212tur_exhaust/

Hope this helps, went with the Evo myself.