Skym

I found this while I was going through the Evo how-to's.

https://www.evolutionm.net/forums/ev...e-flapper.html

I wonder if the RA's muffler is the same..

Does anybody want to be a guinea pig? lol

RADriver

Well if you screw up I have a Ralliart exhaust just gathering dust for you to replace

Skym

LOL Would it be free?? haha
What exhaust do you have on right now?

RADriver

Damn things so heavy it would cost a fair amount to just ship it to Florida from here! lol


UR catback

Skym

Yeah lol I guess that wasn't such a good idea...lol

boondoc

iTrader: (4)

That sounds nice. I'm pretty sure our muffler is exactly the same. The only difference between our and the X is the pipe route b4 the muffler. I think you should do it and report back to us

Skym

Sacrifice one for the whole team huh? lol

stfuad

Cut this hole too small. Almost made it too wide.



Cut a flap about 2 inches on the bottom, to make it easier to cut the tube.



Inside Shots:





No noticeable difference in sound or power. I would like to get it dyno'd but alas I have not the time.

If someone wants to donate a muffler, I'd like to try capping off the ends of the tube I cut, removing that flapping door, and capping off the rest of the holes inside the muffler.

Took about an hour and a half all said and done. This includes welding and waiting for the paint to dry.

edit: As an idea how about making a small h-ish y-pipe from the inlet directly to the outlets. Though that would probably defeat the purpose of the muffler it self. Unless you wanted that stock look.

athmak15

iTrader: (3)

I did this and there is definitely a difference in sound. You need to block off the part that goes around to the flapper. For more sound I cut off my stock resonator.

stfuad

To amend an earlier statement, I have noticed an increase in torque.

Skym

Stock resonator?? Is that he part thats right before the stock muffler??

Skym

But no difference in sound? Outside and in-cabin sound is not different at all?

Skym

Hm... If modifying the stock muffler would make a difference in torque, even if it was a little bit why wouldn't any of the other performance axle back mufflers like ultimate racings wouldn't see any gains??...

velocityhead

iTrader: (3)

It would...but the performance gained from any axle-back is probably negligible.

stfuad

Nothing noticeable to me anyways, defiantly a gain in torque though. I drive pretty consistently so I can't say that the increase in torque is mashing the pedal harder.

I'd like to add, that because I didn't block off the any off the open holes, and just cut the pipe. Is probably why I didn't notice an increase in sound. If I had blocked off the inlet to the muffling portion of the muffler I would have noticed a difference in sound, along with a greater increase in torque. I may reopen the muffler at some point and make a lower case "h" to make it more of a direct flow.