I'm currently running the Summit bullets. They keep my car legal (I'm pretty sure you must have mufflers to pass inspection here in Texas, which they *technically* are), and they don't choke up the exhaust at all (yes, you can see straight through them). They may quiet up the exhaust a little, but not as far as I can tell.

I run Summit 2 1/2x12 in my tailpipes behind magnaflows. Quiet but I suspect they will slow the car. I got them to eliminate the drone.

Anyone try a set of these ?
http://www.summitracing.com/parts/sum-630810

I run the 3" version on my street 64. 413/Mopar 509 cam/headers/h-pipe/turn-downs by the door.

They are quieter than open pipes. No problems with cops. And it is nice to be just a little louder than all the jokers around here in the 5.0 rustangs.

My only complaint is that (at least on my setup) at high RPMs, it is a little metallic sounding for my taste. As a pose to being more throaty.

-Jason

heres a picture of the inside of the summit ones. I havent installed them yet so I cant tell you about the sound.

FWIW the summits I have, you can look straight thru as well.

why to test and waste money?Go with Spintech and be sure

those might cost ya alittle power with those hooks hangin out from the wall. hooker max flow would be another good muffler on the cheap and wont cost any hp. check this out.
Default True Dual Muffler flow and dB comparison, Hooker Maxflow & Bassani Real Street?

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The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).


http://forums.stangnet.com/archive/index.php/t-392314

The Hooker Maxflow made the best power while still being very quiet at idle/2000rpm, but nice and loud at WOT. The Bassani Real Street also made nice power without being too loud. Anybody have any feedback on these mufflers?

I'm using the summit glasspacks as resonators on mine.

my truck had just the chambered "powersticks" at first, and while I loved the aggressive sound, the way it would crackle at high RPM, and under WOT, it would resonate and drone at cruise speeds. I added a single 12" glass pack behind the powersticks.

idle was noticeably quieter, the higher frequencies were toned down, and the overall sound was lower, deeper it's still pretty loud at WOT, but the drone is gone.