My friend is thinking about going with a Dynomax Ultra Flow welded muffler on his 98 SE-R since they are only $60 or so. He wants to just weld on to stock piping. Anyone use one and if so what do they sound like and do they offer any power increase? Thanks.

Although I have never used one.....I have a custon 2.5 inche pipe with serbin muffler. I might be wrong but I think most of your power gain comes from the piping but its good to have around a 3 inche tip.

We are also putting a header on it soon and I didn't really know if the pipe was a restriction or not. What is the optimal size? He doesn't have enough $$ to buy a cat-back so he was just going to get the muffler. No shops around here do mandrel bending either. Well...anyone with more sugestions??:confused:

if youre stayin NA get a 2 - 2.25" size for the b pipe
if youre goin with nitrous get 2.5" piping
if youre goin turbo go with 3"
u can call up stromung for the b pipe, i heard theyre having a group buy on them right now ( just do a search for their phone #)
and courtesy has 2.5 inch b pipe for sale

I have a Dynomax UltraFlo welded muffler on my 200SX. I just got the stock muffler cut off and got the new muffler welded in its place with the stock flange and mid-pipe. Very quiet... Sometimes, I don't even know it's there. Even went as far as using the stock muffler tip and painting the whole thing black for the stealth approach.

RollcageSR20...Any gains with the muffler? Just curious. Thats cool that it is quiet, he doesn't want a loud raspy sounding exhaust, just something a little better than the stock one.

Originally posted by BLKSTANG
RollcageSR20...Any gains with the muffler? Just curious. Thats cool that it is quiet, he doesn't want a loud raspy sounding exhaust, just something a little better than the stock one.

I wouldn't know. I never performed a back-to-back dyno test between the stock muffler and the Dynomax. My "butt-dyno" did register some difference. It's definitely better than the stock muffler... The Dynomax UltraFlo is one of the better straight-through aftermarket mufflers you can buy.

I use the ultra-flo stainless.
I have dyno'd a straight through muffler on the stock b-pipe. It gained 3 hp and 2 ft-lbs of torque, and made more power than the stock muffler everywhere. That was with stock cams. The gains with S3 cams were 5hp and 5 ft-lbs (all measured at the wheels).

I have UltraFlow Welded on my 98 SER. I have custom 2.5" crush bend with the muffler. It's a low buck upgrade with nice sound. I would recommend putting a glasspack after the cat. My butt dyno told me it's faster.

My friend Mark had one on his old se-r and it droned on the highway. I have the super turbo on my car and it doesn't sound very good at all. It buzzes like a honda, although I'm sure a resonator might solve the problem.

I like how mine sounds and it doesn't drone, but I have a resonator and a 19" long can on my Ultra-Flo.

hehe Ryan's sounds hot with the super turbo :rolleyes:

Hey:
I've got a Dynomax turbo muffler 2 1/4" X 18" 3 chamber with a Courtesy B pipe. Flows good. When I run around town at 6,000rpm, no heads turn, so it must be pretty quiet. Can't say it's quiet inside, but it's quieter than the Naxos can I had on there with the stock pipe.
Cheers,
Charlie :)