Drone reducer for Magnaflow exhaust?

[NSXNEXT]

Well the drone is starting to get to me. I have both the Magnaflows and the secondary cat deletes. Seems like a possible solution.

Here's a BMW owner who had success with them.

http://www.bimmerfest.com/forums/showpost.php?p=3475071&postcount=27

This is the product.
http://www.jegs.com/i/Dynatech/329/...&cagpspn=pla&gclid=CIqu2sPD6bgCFYai4AodtVAAvQ

Looks like they could be easily test fit between one of the breaks in the exhaust or in the secondary cat deletes.

Looks like it would increase a little more of the low-end power with the increased backpressure (although they claim it is minimal).

Jegs' return policy is great so if it doesn't do anything I can return it.

 

[Rey]

I don't have any experience with Dynatech. Suggest you continue to check reviews. I did note that the Dynatech reduced a drone at 4K rpm in the BMW. Hyundai's drone is much lower at 1200-1500 rpm.
My own personal experience with the Magnaflow on my 2011 4.6 was that it droned horribly, even after I substitued a Magnaflow X muffler for the straight X pipe. What fixed the drone for good was install of Dynomax VT mufflers. This passed the "wife test" as she didn't notice exhaust sound at all, except when I floored it. Since then I sold the car to a friend and he has put another 25K miles on the modified Magnalflow with no complaints.
The Dynomax VT mufflers are less than $100 each, and I mocked up an install on a Magnaflow for a 5.0 - it should be fairly easy.

 

[NSXNEXT]

Thanks Rey. Yeah I think I may be going the VT way. Looking at the 17949. Center inlet offset outlet.

 

[Rey]

That $30 price is a fabulous price for a VT. If you check the Dynomax online catalog you will see that the inlet/outlet choices are very limited. Basically, Dynomax uses a single muffler body of several pipe diameters. The only hesitation I have on the low price is that I wonder if Dynomax has done some production upgrades. Suggest you call Dynomax and confirm this. You do not want to buy an introductory model if better models exist.

 

[NSXNEXT]

Huh? What $30 price?

 

[Rey]

NSXNEXT: double click on the Dynomax muffler in your post to get the sub $30 price.

 

[NSXNEXT]

NSXNEXT: double click on the Dynomax muffler in your post to get the sub $30 price.

Ah weird. I didn't do that. The BBS system adds those links.
That's not the right muffler anyway.

 

[zielritter]

Looks like it would increase a little more of the low-end power with the increased backpressure (although they claim it is minimal).

Sorry but it's kind of a personal crusade of mine to speak up and attempt to destroy this myth any time I hear it.

Back pressure is ALWAYS bad in an exhaust stream and will ALWAYS cause a loss of power.

What you want to avoid is modifying your exhaust stream in a way that causes a loss of exhaust pulse VELOCITY, which would in turn increase back pressure and decrease power by causing resistance to pulse scavenging during the piston's exhaust stroke.

Frequently people will install a cat-back, header(s), hi-flow cat, muffler etc. in an miscalculated manner and introduce a tube diameter into the stream that causes a decrease in pulse velocity.

READ AGAIN: Back pressure is never a good thing for performance. The factory set up is a good compromise between maintaining low RPM (i.e. small exhaust pulse) torque, while minimizing high RPM (large exhaust pulse) back pressure that would hurt horsepower.

A properly designed aftermarket solution should therefore minimize torque loss by minimizing a disruption on small pulse exhaust velocity while providing a slightly larger diameter tube that reduces back pressure when your engine is running full bore.

/end rant