The custom/aftermarket exhaust thread! [Pics + Videos]

[ryanww]

I have 1.5 Yaris m/t. I'm going to install unichip q+, but I'm waiting for the exhaust set up. I've done porting polish, open filter, megan header, lightweight crank pulley. The megan header outlet is 2". What's the best pipe size and exhaust set up? Is 2" mid pipe all the way until the muffler? Or should i put an oem resonator in the middle? I've tried 1.75" and i put the oem resonator in the middle, but the acceleration was not good. Then i put off the resonator, so it was 1.75" all the way to muffler. It was better than with the resonator. I thing it's because the porting polish maybe. Is there anyone has done some research about the pipe size with piggyback install? How much hp and torque was it?


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[Rakin]

Originally Posted by ryanww

I have 1.5 Yaris m/t. I'm going to install unichip q+, but I'm waiting for the exhaust set up. I've done porting polish, open filter, megan header, lightweight crank pulley. The megan header outlet is 2". What's the best pipe size and exhaust set up? Is 2" mid pipe all the way until the muffler? Or should i put an oem resonator in the middle? I've tried 1.75" and i put the oem resonator in the middle, but the acceleration was not good. Then i put off the resonator, so it was 1.75" all the way to muffler. It was better than with the resonator. I thing it's because the porting polish maybe. Is there anyone has done some research about the pipe size with piggyback install? How much hp and torque was it?


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I have the same engine as you do, I did a full 2" pipe all the way and acceleration was pretty good. Felt decent gains over stock system. I did also remove the cats and put a flowmaster in the process though.