back with a quick review of the dynomax super turbo muffler. bought this one today
http://store.summitracing.com/partde...5&autoview=sku with a 20" case length, i measured the stock muffler on my 4runner at 19". the setup is now LCE header with 2" merge collector, to cat, to 2.25" pipe and muffler all the way back. after the 50$ muffler, i paid a local shop (Nevada Muffler) 155$ for the pipe and install. they kindly did a solid job.
i'm pretty happy with the setup, i got exactly what i was after. from ignition to idle, there is virtually no change in stock sound unless you are within about 10 - 15 feet, then you can detect a mini rumble (or a grumble?). on revs, the sound is more pronounced, but never loud. at cruising speed, there is again virtually no change from stock sound (in the drivers seat). I have my top off now, and so i have a pretty good impression of how it must sound from the sidewalk too. I didnt detect any interior resonance, but that might change when i get the top back on this fall.
in terms of performance, the truck is more smoothly sailing up throught the rpms, and i used to have a slight hesitation at around 3100 which is now gone (along with the hole in my old exhaust, related i think). also, since all the joints were welded tight, i have now isolated my exhaust leak to the block or the first cat flange (second one is now gone and welded). overall i think the engine does now breathe better, but as with my tacoma, i think most of the gains were made with the header (i've never done it the other way around).
so much for a quick post. the last item is this: i think you can get the same muffler at napa auto. the dynomax parent company, walker, supplies the napa branded mufflers, and a little more digging could turn up a decent savings on the same item. i started to chase that one down - i think i found their "super turbo" before which is probably the exact same item for around 42$, but i was in summit racing today and decided to just get the job done.