Jigen

iTrader: (3)

Hey guys, my LS1 is new to me so besides a lid and some free mods it's stock. First thing I am trying to do is get a new catback. I don't want anything too loud since this car is my DD, so I am thinking about going with the Magnaflow. Anyway, how restrictive is the stock catback, and will I notice a difference in the cars feel? Any comments are appreciated.

black_phoenix

iTrader: (27)

I am actually waiting for magnaflow right now in the mail LOL. I was told it is a very good flowing catback, it's not too loud but not too quiet either. As far as power difference, you should not feel any noticeable ( i hope to prove this wrong off course).

mtinkle

iTrader: (4)

after my Magnaflow catback install i wouldn't say i "felt" a difference, but it's definately a different driving experience. i don't know about you, but i like hearing almost as good as feeling a difference

GinoLS1

iTrader: (1)

You'll feel a difference once you put your "full exhaust" on. See stock LS1's as you know come with a pinched and catted y-pipe which restricts horses. Get some Long Tube headers and and Off Road Y-Pipe and you will definitely feel the difference.

777

iTrader: (21)

Notice a difference all the way around. Pick about 10-15rwhp.

blk/slvr02ss

iTrader: (21)

My 02 SS still has the stock cat back on it w/SLP long tube headers & off road y-pipe and ran 12.61@ 106 so i say the stock cat back flows pretty good.

tylerdj

iTrader: (31)

IMO you should just throw a cutout on there. But you should see gains around 10 hp roughly.

darrensls1

You'll hear more of a difference then you'll feel. The gains from a stock catback to a magnaflow will probably be 7-12 rwhp. When you go from 300 to 310 rwhp it's hard to honestly feel the difference.

But if you do LT headers at the same time as the catback then the gains will be closer to 30 rwhp and you'll probably feel that a lot easier

Snowman2K1

iTrader: (1)

what bothered me more of the stock catback in my camaro was the look lol ...so i opted out for a slp 1 ..and yeah after adding longtubes and off road y pipe you feel a difference but its freaking loud!!!

miamifan3413

iTrader: (1)

I added a lid and Magnaflow at the same time and felt a nice difference 3000rpm and up. If you want to really feel something, put some gears in

Jigen

iTrader: (3)

Thanks guys. Now I will still be running my cats, and as of right now everything else is pretty much stock. I searched around and some posters say a y-pipe can be a waste of money if I dont have anything else done to the car. Sorry to sound so newbish, but is this true?

tylerdj

iTrader: (31)

You could probably see some slight gains, but not enough to justify the cost/labor. The stock cats are pretty going to hold you back a lot.

Jigen

iTrader: (3)

Still worth getting the catback though?

tylerdj

iTrader: (31)

Yea, more for sound than anything but you'll free up a few hp.

DRGnFLYZ28

A nice SOTP gain and a smile from ear to ear when you first romp the loud pedal!

Sharpe

iTrader: (7)

Don't have one. I havecut-outs (behind QTP headers). Closed, my car sounds stock. Open, it sounds meaner than any car I've ever heard.

Performance for $0: saw off the cat-back from the I-pipe!

If i were just getting a cat-back, I would certainly keep the Y. Get the Y with the headers, for sure.

ZMONSTER!

iTrader: (9)

Ive read that hooker flows better than most, but I just went with the magnaflow. Check out LS1 sounds for sound clips..

Juicy J

iTrader: (5)

Magnaflow was WAY too quiet for me. I hate it when I start my car up, and can't even tell its on. No sound at all at idle. I bought the car with it, and did not feel like buying another muffler when I was going to go to TD's anyways, so I just dumped it after the y. It really isnt loud when it is still going through the cats.

Magnaflow sounds good at WOT, but it still is pretty quiet. I got bored with that muffler pretty fast.

Your car will not be loud as long as its going through the stock cats, and manifolds no matter what you put after the y.

Jigen

iTrader: (3)

Thanks guys. I did check out ls1sounds, and I like the relative quietness of the magnaflow. Is it really more quiet than stock at idle and low rpms?

Juicy J

iTrader: (5)

Close to it. As I said, with whatever cat back you get with stock y and manifolds, you arent going to get alot of drone, or get a headache. At low rpms you wont hear any exhaust noise with the radio on. You are not going to be competing with the exhaust noise if you are trying to talk to someone in your car.

I would really look into something else besides Magnaflow. Too quiet imo. Not enough difference from stock to be worth the money imo.