red90cobra

iTrader: (36)

On a single turbo setup? I have one laying around. Was going to use it before dumping it before the axle. Will this hurt the performace? Thanks.

98Z28CobraKiller

iTrader: (17)

What size is the DP flange on the turbo?

Pro Stock John

iTrader: (34)

It's not straight-through so I'd throw it on if I was trying to quiet the car down, but I'd rather have a muffler that you can see through.

SilverSS

iTrader: (30)

No way I would use one of those ever again. I gained 18rwhp switching to a straight through muffler but I'm not turbo though. This was with a 3" catted y-pipe dumped at the axle.
With spiral flow muffler - 601rwhp. With straight through bullet muffler 619rwhp on the dyno.

NightHawk

iTrader: (1)

+1

I have two on my car now in a true dual setup and cannot wait to get them off. Dynomax bullets are too cheap to not go with over a spiral flow.

FastKat

iTrader: (10)

Are the spiral-flows noticeably quieter than the dynomax bullets?

SilverSS

iTrader: (30)

yes they are noticeably quieter especially on a cold start-up.

LS1Silverado05

iTrader: (41)

I have heard they sound good, but if you look inside one, Im not so sure that the flow is very good at all...

red90cobra

iTrader: (36)

3" I believe

and thanks for everyones input on the matter. just need to decide if i want to quiet it down or go all out performance.

stevieturbo

I used one ( a pair ), its internals fell apart, almost clogging up the entire flow path.


And TBH, after switching to straight through perforated tube design...they do actually do a better job of reducing noise.

LS1RedZ

iTrader: (19)

If your gonna use one. Make sure you have a cut out before it. I picked up 50rwhp when I opened my cut out. I have a ORY with a spiral flow into CME center mount exhaust. I would do a straight through muffler.

jay_rich

iTrader: (8)

my buddy lost 50-60rwhp with spiral flows on his 99SS

Jay

ChevyChad

iTrader: (50)

Wow! All these people doggin the spiral flow kinda makes me want to not put mine on that I bought a while ago. I think they spiral flows are the absolute BEST sounding mufflers for the LS engines. I absolutely hate the way my borla sounds on my car. I guess I could still use the spiral flow for noise reduction and a better sound, and just use my e-cutout for those times I need the extra power..

z28mccrory

iTrader: (7)

I call BS on that unless the power it was making was HUGE.

Im sure they flow better than the stock mufflers, and people dont GAIN 50-60rwhp no matter what they put on.

LS1RedZ

iTrader: (19)

Thats exactly what I bought mine for. I got tired of the damn drone sound with the Loudmouth. If somebody is feeling a little frisky, just open the cut out!

Pro Stock John

iTrader: (34)

If I ran ran one of those mufflers on any street strip car, I'd either run a cutout before it or I'd take the muffler(s) off at the track.

For straight through mufflers that work well, check out:
Borla XR1
Dynatech Splitflow
Dynomax bullets (the loudest)
Magnaflow

stevieturbo

Magnaflow for me. Sorry to say it, but the Spiral Flows are ****.

SuperZ

iTrader: (2)

For quiet smooth sound
Borla XR-1
Dynomax Ultra flow

(LOUD CRAPPY SOUND)
dynomax bullet

All straight through

WillR

I have Flo-Pro Twisters on my dumped TD's they sound pretty good. Not sure about flow or loss of power with them. There is no drone in the car though.