2ZR Turbo Yaris

[06YarisRS]

Megan Axleback???

I've got to get rid of my Megan axleback on my 2ZR turbo application. I did some measurements today and was very surprised to see just how restrictive the Megan is. At the narrowest point where the exhaust tip attached to the muffler body it is ~ 29mm (1.14")! This may be fine for a NA Yaris, but the stock exhaust actually appears to have a larger diameter. I'm pretty sure that backpressure is limiting my car from reaching full boost. I won't be going anywhere near boost or likely even driving this can again until I can rid myself of the Megan and find an alternative.

This is not intended to criticize the Megan product, and I should have done better research, but it's still very surprising that a product with what appears to be 2.5" mandrel bent SS piping would narrow to basically an inch.

I used the handle from my pruners to try to gauge the inner diameter.

Megan narrows a LOT:



Inner diameter contact points:



29mm (1.14")



Stock Yaris exhaust 38mm (~1.5"). It may narrow down more at the muffler, but not by much, I expect.