I researched for about a month on what I wanted as far as exhaust. I listened to and researched SLP's, Magnaflows, and Flowmasters. The SLP LM 1's caught my attention and they're what I went with. I have no regrets as they sound awesome on my car and it is by far the best exhaust system I have owned...and I've owned quite a few.
The SLP's were an easy install, they are a quality product, and they look as good as they sound!
__________________
2002 Mustang GT auto: SLP LM1, 8" shorty antenna, grille delete, coin delete, Cervini front bumper, SCT SF3 93 octane, JLT RAI, Professional Products 75mm TB and Plenum, FRPP 4.10, 10.5x17 DD Bullits, Nitto 555R's
1/4 in 13.828 @ 99.13 "American muscle needs a healthy diet of Foreign rice."
i was originally gonna go with flowmasters but somebody told me the loudmouth would give me more hp because theyre straight through and they would be louder. but i want the throaty muscle car sound like the flowmasters... hmmmm
2004 GT with nitto 555r, jlt ram air intake, S style black rimes, SLP cat back shotguns mufflers, bassini X pipe,3.73 gear. bbk 70mm throttle body, sct mass air flow meter comp cams ae270xe stage two.
With exhaust go for the sound you want. The amount of hp gain/loss between various mufflers and x/h pipes are miniscule. Nobody has ever lost a race, because of the 3hp more, they could have made with a different muffler or x/h pipe!
If you want the old school "muscle car" sound, an h-pipe and 1 or 2 chamber Flowmasters (or another chambered muffler) is the way to go. If you want the "modern euro" sound go with an x-pipe and straight through mufflers.
Btw, if you're looking for loud, the 2 chamber Flowmaster 40's are louder than the 2 chamber 44's. The 1 chambers are even louder still. My setup is Hooker longtubes, o/r h-pipe and Flowmaster 40's, no tailpipes. You could call it loud.
With exhaust go for the sound you want. The amount of hp gain/loss between various mufflers and x/h pipes are miniscule. Nobody has ever lost a race, because of the 3hp more, they could have made with a different muffler or x/h pipe!
If you want the old school "muscle car" sound, an h-pipe and 1 or 2 chamber Flowmasters (or another chambered muffler) is the way to go. If you want the "modern euro" sound go with an x-pipe and straight through mufflers.
Btw, if you're looking for loud, the 2 chamber Flowmaster 40's are louder than the 2 chamber 44's. The 1 chambers are even louder still. My setup is Hooker longtubes, o/r h-pipe and Flowmaster 40's, no tailpipes. You could call it loud.
This post pretty much sums it up. Buy a catback for the sound, period.....
As far as 1 chamber flowmasters, I have them with an off-road X, and they're LOUD!!!! Too loud and raspy for me, honestly. I'm swapping to a H with my header install to get rid of the raspiness, and then I'll make a decision on whether to keep them or not.
3/4 throttle run with a soft take-off....(clutch was slipping a tad)
Its a tough decision, I had SLP LM1 cat-back for awhile but wanted a deeper loud NASCAR sound. About a year later I got the SLP Catted X-pipe added on and you wont believe the difference. If you want a racecar sound go with full SLP, prices aren't too bad either. I would recommend professional install, especially the X-pipe.
just doin some research before i buy. what about the single chamber flowmasters...?? anybody heard those? how do they hold up to the slp?
There are 2 types of 1 chambers. There are some really small ones (which are next to nothing and sound like crap) and the other ones are slightly smaller than a 2 chamber but loud.
Your probably already doing it, but you tube helped me a lot in my which exhaust to get research. Those people on you tube have everything you can think of.
I have Mac 3" with 3 1/2" tips. I also run a Dynomax 2 1/2" offroad X pipe. It's sounds awesome, but is a little on the loud side. I'm entertaining going with a Basanni catted X pipe. But as far as sound........ at idle, outside, my car sounds like it's in a tunnel. And driving it just gets better.
__________________
C&L 80mm mass air and True Flow pipe, Mac CAI, BBK 65mm tb, Steeda non-piggy back ud pulleys, MGW shifter, RAM HD clutch and aluminum flywheel, 3:73 gears, 2.5" Dynomax o/r x pipe, 3" MAC cat back system w/ 3 1/2" tips, Kenny Brown(front and rear strut tower brace, caster plates, subframe connectors,extreme matrix brace,jacking rails, torque brace, lowering springs), Bilstein shocks, 03-04 Cobra(side scoops, rear bumper cover, top), 6pt roll cage, white FR500's, FMS 2000 Cobra R air dam.
Best and loudest? 
