Flapper off...........
02-01-2019, 06:32 PM
#62
Which exh are you running? I'm assuming the 6.2 catback?
02-01-2019, 07:27 PM
#63
In a way I'm glad you said that, I'm really debating doing a large case Magnaflow right now on my exhaust. On the 5.3 exhaust it was great. But now I have the 6.2 exhaust and it's as loud stock as the 5.3 exh was with the Magnaflow. I hate not having a straight through but I also do not want this truck to be loud. A little sound is fine, but loud isn't.
Which exh are you running? I'm assuming the 6.2 catback?
Which exh are you running? I'm assuming the 6.2 catback?
02-03-2019, 09:58 AM
#64
TECH Fanatic
Thread Starter
iTrader: (1)
Hey Pooter, for straight thru muffler check out the Flowmaster 70. I had one on my last truck- while it was a bit tonier than stock it did drone, though I wonder how much the Air raid MIT tune contributed to that- I was fixing to put on a resonator. But seeing your setup with headers and such, Flowmaster 70 looks to be the thing...……….
02-03-2019, 03:24 PM
#65
Hey Pooter, for straight thru muffler check out the Flowmaster 70. I had one on my last truck- while it was a bit tonier than stock it did drone, though I wonder how much the Air raid MIT tune contributed to that- I was fixing to put on a resonator. But seeing your setup with headers and such, Flowmaster 70 looks to be the thing...……….
02-03-2019, 04:07 PM
#66
TECH Fanatic
I’d think 3.5” is a touch over kill for a 5.3. I’m in the process of redoing my exhaust and will be replacing the GM Borla exhaust with a single Borla xr-1 and am planning 3” all the way through.
02-04-2019, 07:47 PM
#67
If mine is overkill it certainly isn't costing me any power and I'm all in on my catback at $230 including clamps, gas money, having the flap cut out, other welding, etc.. So I couldn't make sense of going any other direction, plus most complain the aftermarket systems are too loud and they spend a ton of money adding mufflers etc to get them bearable.
I would have also guessed 3" was plenty myself before reading this. The hp ratings per pipe size are a little surprising.
https://m.roadkillcustoms.com/determ...t-tubing-size/
Last edited by 00pooterSS; 02-04-2019 at 08:03 PM.
02-14-2019, 10:34 AM
#68
TECH Fanatic
Finally got around to reading that link. Not sure I agree with it entirely. Case in point is my charger. 392ci rated at 485hp. For a dual system that chart shows minimum pipe size to be 3". The car comes with 2.75" factory and there have been no proven gains with increasing from that pipe size until 600+hp. Their two charts kind of contradict each other as well because in one they say my engine needs 3" minimum for 400hp (max the chart goes to) and then the other it says 2.75" will support 566hp in a dual setup. But when you look at it for our trucks it lines up.
Who knows. I'll probably do 3.5" since I'm in there anyways.
Who knows. I'll probably do 3.5" since I'm in there anyways.
02-14-2019, 10:58 AM
#69
Finally got around to reading that link. Not sure I agree with it entirely. Case in point is my charger. 392ci rated at 485hp. For a dual system that chart shows minimum pipe size to be 3". The car comes with 2.75" factory and there have been no proven gains with increasing from that pipe size until 600+hp. Their two charts kind of contradict each other as well because in one they say my engine needs 3" minimum for 400hp (max the chart goes to) and then the other it says 2.75" will support 566hp in a dual setup. But when you look at it for our trucks it lines up.
Who knows. I'll probably do 3.5" since I'm in there anyways.
Who knows. I'll probably do 3.5" since I'm in there anyways.
All I know at this point is I didn't lose anything by going with the stock 3.5 and I kept a whole bunch of money and sanity (not too loud driving me crazy).
Z06ted rode in mine yesterday and was really impressed with how quiet everything was and the sound of the 6.2 catback.
We also talked about how it necks down from 3.5" to 3" and I believe he recalled hearing something about pipe sizing going down over the length of the pipe being part of exh tuning and I remember hearing something about it to. So now I'm on the fence, I was considering making mine 3.5" all the way, but I think I'll leave it.
What I really should do is dyno it with open headers, vs y pipe, vs full system attached. But the flipping driveshaft will pop before I could make it through a dyno run.