The ones I think that are mentioned the most are Walker( Dynomax) and Flowmasters, but there are more that others can mention which are well liked. They come in short and long case versions which are 20 inch on the Dynomax and 19 inch I think on the F Masters. I think the short case ones are too loud. I saw one test with the long case in which the Dynomax l flowed a little better and was quieter. Summit I think both brands. The test I saw also said that all other things considered equal the long case flow better than the short case.
Ken I agree about the x pipe addition. All these mufflers seem to drone loudly at some rpms especially the Flowmasters. The X pipe really quiets this down and by test results adds to the flow and horsepower. I like the Dr Gas which unlike some others is reinforced. It is used in NASCAR. Also congratulations on making another click on your odometer.
I had the dynomax Super Turbos supplied with my 2.5 system from TA. One had a loose baffle (uncommon and covered under warrantee) and I did not care for the droning sound. So, using advice from this board(!!) I decided to buy the longest case high performance muffler I could find. I came up with an UltraFlow Welded, also by dynomax, but a straight thru design-but the case is like 24", its for RV applications, not listed @ jegs but on the Dynomax web site. They sound great, really deep idle, deep powerful sound @ WOT. It is my personal holy grail of "tone". I do have a H-pipe too. The fit is tight but good, they tuck up in there just right. Good luck,
I've got the Walker Dynamax Super Turbos, I thought they were a little loud and droned with iron manifolds and a straight dual. Since have modified the car with headers and a Dr Gas X-Pipe, same mufflers and tailpipes, and I don't hear a thing when driven normally. Sounds just like a sleeper. Loud at WOT, just like it needs to be. Exhaust is 2 1/2" mandrel bent aluminized steel.
i've always thought a lot of the noise factor in an exhaust system has more to do with the total length and size of the pipes before and after the muffler. in a system with 2 1/2 " pipe from engine to muffler and 2 1/4 from muffler to the farthest point away from the engine, the "noise" is negligible, in a shorter system the sound will be louder depending on where the peak power is made, but still louder than a longer system. and i dont think the brand is as important as the size and type of muffler used. i had a '55 chevy pickup with small block, headers and straight pipes that cut out below the doors, and it was LOUD! this is an extreme example, it seems to me the vehicles i've had that had engine-pipe-muffler-dump set-ups were the ones that seemed to exhibit the greatest variable in sound, from dull rumble to roar depending on throttle position and muffler type [turbos, usually]. any thoughts?
I agree somewhat. Race mufflers tend to drone a lot more than street mufflers due to their designs. I ran Moroso Spiral Flow race mufflers with turndowns before the rear axle for a day. My ears were ringing so I took it back to the shop and had them put the pipes out the back to shoot straight out under the bumper. It cut down on the noise, but the drone was considerable from 1800-2200 rpm. A year later I switched to Flowmaster 50 series. The tone is much better, but the full throttle wail is not as loud. They still drone, but it is on a narrower 1800-2000 rpm band.
