06YarisRS's 2ZR-FE Swap 5-Door Hatchback (Automatic Transmission)

[06YarisRS]

I went out for another drive this evening and I'm impressed. Took it out on the highway and found the steepest hill I could. I set the cruise control at 120 km/h. With the 1NZ and cruise set, it would always drop a gear. The 2ZR powers up the hill without a gear drop and not even a detectable increase in rpm. Awesome!

I was under the back of the car rigging up a bungy cord on the hanger to stop the clunking just for tonight. I had a look at the midpipe and I'm thinking I ought to have the exhaust shop chop the pipe at the resonator and upsize the pipe to the rear flange at the axle. Maybe to 2" or 2.25". I know that my muffler will be much more free flowing than the stock muffler, but I can't help but think that that midpipe is really restrictive. Taking into consideration what you have all said - and done - as well as reading a thread by 'the barber', I'm thinking this is the route to go. I've heard that a freer flowing (maybe too free-flowing) exhaust can adversely affect torque and I wouldn't want to lose any of that. Thoughts/comments welcome as always.