I am planning out my build for my car and am not sure what cat back to go with. I will have about 400whp NA and I will put a 100-150 shot on top of that. I will have LT headers and a ORY to go with it. I am looking for an exhaust that will flow enough and yet still be as quiet as possible. I would like to stay away from true duals. I also don't care if I have only one pipe coming out the back.

Is there a cat back out there that will work for me or am I going to need to go the custom route? If I must go custom what muffler would you recommend? Price is not a big concern and stainless is a plus too. Thanks!

 

Quiet - stay with stock.

 

Heard the hooker is pretty quiet and flows pretty well too. BOOOO QUIET

 

SLP Dual Dual

 

Hooker or Magnaflow is quite. but when get on it its loud

 

What muffler does the magnaflow stainless cat back come with? I am looking for sound clips on it but I am not having any luck.

 

just get a cutout

 

I might just do that. I have thought about it but it seems that alot of people have trouble with them.

 

With 400 rwhp and a large shot of juice you are restricting power quite a bit with a catback. If you still insist you should go with mufflex 4 inch.

 

edelbrock mufflers are pretty quiet with a real low rumble but i dont think they make a catback

 

Just stay stock if u want quiet and put a cutout on it. But seriously why do u want it quiet?

 

~400 rwhp, NA, without true duals

Exactly what do you have planned in this build? I suspect there are other more significant problems that need to be adjusted before the sound of the exhaust.

 

This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002 issue (page 55) on a '90 Mustang LX coupe with 370hp and 11 second potential. 66 pulls were made for this comparison:

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).

 

Thanks. Spelling errors drive me up a wall.

 

magnaflow, its quiet yet has a nice deep tone and flows good too.

 

Yeah I think I am going to go with the magnaflow and put a cut out on it after the ORY. How bad would it choke the engine down with the cut out open?

 

omfg slp loudmouth is soo sososososo quiet!

 

I have Magnaflow and it makes for a nice quiet cabin ride but makes noise when you want it!