I've read two posts now that state that the muffler sits against or rubs against the heat shield on the inner (gas tank) side.

I've got one reply that says those two didn't properly install the exhaust, and that if the hangers are pushed all the way into the rubber doughnuts, that it doesn't hit or rub anything...

I've read two posts that say it's excellent, and that fit and finish are great.

But I've read another post that says that it looked like "cheap steel" and wasn't at all what they expected for the price.

Does anyone have any hi-res pictures of the M2 dual tip installed and/or uninstalled? I like the "one piece" tip look instead of the "tip within a tip" look of the RB, and believe I read that the tips on the M2 are a little larger than the RB, which is what I'm looking for.

Thanks!

 

PM'd you, Jim.

 

Thanks Damon. I'm going with the M2 cat-back based on your advice.

 

Jimlab -

I put one of these on my car about 3 months ago and I am extremely happy with it. The install/fit was fine, although my heatshield is mangled so it may be bent out of the way. The quality looked great going on but I have to admit I haven't looked at it since to see how it is aging.

The sound is awesome. It is louder than RB but quieter than anything else I have heard. It has a deep (for rotary) mellow sound.

I keep thinking I will record it someday and make an mp3 out of it to let everyone hear but damn if I can't find time to get to that with all the other things on my rx7 list....

Shawn
www.3rdgenrx7.com

 

Damn, now I'll be wondering about DamonB's mystery advice

 

Damon said that he switched the rubber exhaust doughnuts from one side to the other and the muffler canister lined up perfectly in the heat shield.

 

Again, no issues here with the M2 Dual tip. If anything at all, I would say that the outlets sit about .5" from the bumper valence, which seems a little close. This could be due to a number of things, but overall, everything is as advertised.

The sound is excellent, and the look is perfectly stock with the exception to the slightly larger diameter pipes, and polished canister.

Can't go wrong.

 

Whats the word on flow with this thing? Comparable to?

I have a PFS muffler that i think is an excellent blend of weight, sound, and flow. Anybody owned both that could compare?

 

I have a RB dual tip and I've had a PFS single tip. I like the dual tip vs. large single tip for looks. The PFS is loud compared to the RB dual tip.

As for HP, I doubt that it makes that much difference, unless your really pushing huge HP.

Jeff

 

how much louder is the m2 dual tip vs. the rb dual tip?

 

I currently have the PFS and I am also getting the M2 (because I want something quieter). My plan is to do a before-n-after video, so stay tuned (it will probably be a couple weeks tho).

 

i have the RB dual tip. i love it.... sound, quality, everything. my exhaust is approximately 5 years old still works great !

 

I went from the PFS single tip to the RB dual tip also. The PFS single tip sucked ***, to be perfectly honest.

It was an eyesore, much like a pimp's pearl handled chrome revolver. Too much *bling* for my taste, with that big ol' polished canister hanging under the car. I'll be painting my M2 dual tip for "stealth" points, and my RB twin tip was painted also.

It droned horribly at highway speeds. A constant, annoying bwaaaaaa, much like a Honda with a 5" tip. Of course, my car was non-sequential, and that may or may not have had anything to do with it, but it was still incredibly annoying.

It was loud as f*ck, and that did have everything to do with my being non-sequential, but still... I put a Borla XR-1 into my midpipe (I think I may have pioneered that mod) to tone it down some, and it did make it quieter, but didn't eliminate the bwaaaaaa. Scheisser.

It backfired badly, even with the Borla in the center section. I know that some of the kids think that's cool and in fact try to get flame out of the muffler, but then wonder why they got pulled over for their loud-*** exhaust. If you think it's cool, you've probably watched the drag race starting line scene in The Fast and the Furious too many times. You probably think "drifting" is cool, too...

I got rid of the damn PFS single tip and got the Racing Beat twin tip, and all of a sudden my problems were solved. I didn't cringe about coming home late at night and waking the dead. I didn't have backfiring any more. I didn't have an awful buzzing drone at highway speed. I could actually hear a passenger well enough to carry on a conversation. And I didn't notice much, if any, drop in performance.

If I liked the Racing Beat twin tip so much, why did I sell it to buy the M2 twin tip? Because it was old and grimy, and everything going on my car is new, and the new style RB twin tip has ugly tips.

 

Please let us know whether you end up using Krispy Kreme or Dunkin' or some no name brand...

Seriously, I've had a RB stainless dual for maybe five or six years. Perfect fit, excellent construction and finish, and the sound has been to my liking. I believe the current ones are different, so I guess that these comments don't mean squat to anyone who's contemplating a purchase, but I've already typed 'em and I'm not going back.

That said, if I were in the market today, I'd buy an M2 dual. The tips look better and potentially less restrictive to me. The RB tips actually neck-down to a smaller diameter as they go into the muffler canister, and the M2 tips do not. Without some type of flow testing, I guess we won't know, but hey, it doesn't *look* as restrictive so that has to count for at least a ham sandwich

 

I used a ham sandwich as an exhaust gasket once. Gave me about 35 horsepower I figured, mostly because of the mayonnaise lubricating the flanges.

 

Speakin' o' flanges, I was at the burnsstainless site and noticed that they have another type of band clamp arrangement that you may want to look at (if you're still considering the v-band clamps)...

 

Which clamps are you referring to?

 

I would like the ham sandwich idea, if I wasn't a vegetarian.

 

 

"Wiggins" clamps. Top right of their homepage. Don't know anything about them-- I just noticed them the last time I was there and remembered that you were looking at flange alternatives...

http://www.burnsstainless.com/Hardwa...insclamps.html

 

frequently used for vacuum lines, water lines, and turbo intake plumbing.

They're made from aluminum, unfortunately.

 

Oops--- heh, consider it a head start on your turbo intake plumbing

 

I've never seen a seen a sinle tip version but I saw a dual tip version on one of Ivan's customer's car before, and the fitment was like crap. The thing rubbed against the gas tank and the fit and finish looks like a cheap dynomax muffler.

Of course, this was over a year ago, when the exhaust first came out. Since then, M2 may or may not have corrected the fitment issue (I know a lot of their products are not consistent since they always use different machine shops). In my opinion, get the racing beat exhaust, you can't go wrong with the quality.

However, if you don't care about noise then i'd rather have an apex'i over any of them

 

hey fritz flinn, i have had my pfs single tip for about a year or so i would be interested i selling it to offset the cost of a m2.

 

I just ordered two of the M2 dual tips (one is for a friend), and I'll be sure to post pictures of the exhaust both off and on the car.