Summit Exhaust System, fully welded mufflers - NJFBOA - Home of New Jersey's Camaros and Firebirds

WildBillyT · 09-25-2009, 07:03 PM

I took the plunge earlier this week. I bought their 3" aluminized header back dual system for my Nova:

http://www.summitracing.com/parts/SUM-680102

With the 10% off and the house brand discount it ran me only $200. Granted I wasn't expecting to get a polished Corsa for that amount, but the system looks worth every penny. Nice mandrel bends, nice tubing. Feedback on other sites is very positive.

The mufflers themselves are definetly white box versions of some type of performance muffler (dynomax)? Either way, they should sound pretty decent considering that some of the flow gets a straight shot through:

In a muffler test here's how they performed:

The Mufflers
MAKE MODEL Part No. COST
SUMMIT Turbo 630125 $14.75
THRUSH Magnum Glasspack 24214 $16.50
THRUSH Boss Turbo 17718 $23.95
HOOKER Competition 21006 $25.95
DYNOMAX Super Turbo 17733 $28.50
DYNOMAX Race Magnum 24215 $31.95
HOOKER Super Competition 21106 $35.95
SUMMIT Fully Welded 630325 $38.69
FLOWTECH Afterburner 50322 $39.95

MUFFLER FLOW TEST

MUFFLER Flow at 28-in H20
Hooker Competition 232.46 cfm
Thrush Boss Turbo 297.36 cfm
Hooker Super Competition 320.96 cfm
Summit Turbo 331.16 cfm
DynoMax Super Turbo 333.94 cfm
Flowtech Afterburner 342.20 cfm
Summit Fully Welded 343.38 cfm
Thrush Magnum Glasspack 507.40 cfm
DynoMax Race Magnum 528.64 cfm

MUFFLER Idle dB WOT dB
DynoMax Super Turbo 89 123
Summit Turbo 89 124
Thrush Boss Turbo 90 123
Hooker Super Competion 90 125
Hooker Competion 92 122
Flowtech Afterburner 92 124
Summit Fully Welded 92 125
Thrush Magnum Glasspack 92 128
DynoMax Race Magnum 94 133

DYNO TEST
All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.

MUFFLER HP TORQUE 2,500-6,000rpm Average
Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft
Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft
DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft
Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft
Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft
Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft
DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft
Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft
Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft

I'll post up pics of the install when I get started.

wretched73 · 09-25-2009, 07:40 PM

Wow, that sounds like an unreal deal

JL8Jeff · 09-26-2009, 10:21 AM

I had the Summit 3" turbo mufflers on the SS396. They sounded great with a nice rumble but not too loud to talk in the car while on the highway with the windows open. It felt like the car picked up a lot of power going from the 2-1/4 to the 3" dual exhaust. I think the Summit mufflers are Dynomax.

Tru2Chevy · 09-27-2009, 04:32 PM

Yea, I just put a Dynomax Super-Turbo catback on my Cherokee, and the supplied muffler looks quite a bit like what you have pictured.

- Justin

WildBillyT · 01-23-2010, 04:53 PM

Update:

I haven't run the pipes all the way to the back yet, so there is a lot of resonance under the car. But it is very loud. Sounds almost exactly the same as an open exhaust with dynomax bullets.

JL8Jeff · 01-23-2010, 05:39 PM

You heard my 396 with the normal Summit turbo mufflers and it had a nice rumble at idle but was not bad at all while cruising on the highway at speed. Tailpipes might make a big difference, but I thought the Summit mufflers were Dynomax blems so they should be similar. Don't judge without tailpipes though.

WildBillyT · 01-23-2010, 06:08 PM

Quote:

Originally Posted by JL8Jeff

You heard my 396 with the normal Summit turbo mufflers and it had a nice rumble at idle but was not bad at all while cruising on the highway at speed. Tailpipes might make a big difference, but I thought the Summit mufflers were Dynomax blems so they should be similar. Don't judge without tailpipes though.

Yeah, I'll get a sound clip once it's all done.

Bcozzi71 · 02-26-2010, 12:17 AM

wonder if it could fit under a 3rd gen with some work...

WildBillyT · 02-26-2010, 08:25 AM

Quote:

Originally Posted by Bcozzi71

wonder if it could fit under a 3rd gen with some work...

Probably, but it wouldn't fit the greatest.

I finally got it all on there. The tailpipes kill some of the in-cabin noise, and it's fairly mellow at idle. From 2500 RPM up it's loud. Loud enough to get the neighbors a quarter mile away to stop by to say hi.

The only mod I had to do was shorten the passenger side pipe by 3". Probably due to header variances, but it was easy. Other than that it was a bolt on.

BonzoHansen · 02-26-2010, 09:22 AM

Quote:

Originally Posted by Bcozzi71

wonder if it could fit under a 3rd gen with some work...

Short answer is no. you have legal issues with the cat and the tail pipes will not work, so you'd have to dump in front of the axle, also will fail inspection.

WildBillyT · 02-26-2010, 09:37 AM

Quote:

Originally Posted by BonzoHansen

Short answer is no. you have legal issues with the cat and the tail pipes will not work, so you'd have to dump in front of the axle, also will fail inspection.

Forgot about the coil springs. Yeah, it probably won't work.

Bonzo once it stops being so cold out I'll blast your headers and get em back to you.

LTb1ow · 02-26-2010, 10:15 AM

So do we get any under chassis pics of the setup?

or any drive by vids?

WildBillyT · 02-26-2010, 10:21 AM

Quote:

Originally Posted by LTs1ow

So do we get any under chassis pics of the setup?

or any drive by vids?

Next time I am there I will. FWIW the mufflers look like Walker Sound FX mufflers from the outside at least. Spot welds even look like they are in the same place. I'd have to see the internals of the Walker muffler though.

CHRIS67 · 02-26-2010, 11:08 AM

I tried Summit headers and had fitment issues against the block on the one side, sent them back then the next set had the collector pointed at an odd angle, sent those back and the third set had fitment issues against the block. Ended up with Headman Headers and the first set went in perfect. Sometimes saving a few bucks works sometimes it costs you more in other ways.

JSPERFORMANCE · 02-26-2010, 07:33 PM

Quote:

Originally Posted by CHRIS67

I tried Summit headers and had fitment issues against the block on the one side, sent them back then the next set had the collector pointed at an odd angle, sent those back and the third set had fitment issues against the block. Ended up with Headman Headers and the first set went in perfect. Sometimes saving a few bucks works sometimes it costs you more in other ways.

Amen!