The custom/aftermarket exhaust thread! [Pics + Videos] - Toyota Yaris Forums

j-san · 05-21-2014, 05:13 PM

A question for you exhaust gurus:

A search of the forum turns up conflicting reports of a freer-flowing aftermarket exhaust system improving/hurting MPG. Some said it improves MPG and power, others have said it hurts MPG, but improves power. Either way, it seems a better exhaust will improve power and possibly affect MPG.

I drive with a fairly light foot and mostly on the highway and average 43MPG most days. My Yaris is stock, but I am open to doing an aftermarket exhaust, provided it doesn't sound like bad rice and seriously hurt MPG. I wouldn't mind the few extra HP for a little help in the passing lane. If I go aftermarket, I plan to leave the intake stock and drop in a K&N filter. Maybe a header is fine, but I plan to leave the cats and resonator intact and possibly add an additional resonator after the stock one. There is a local custom exhaust shop that can do the work and I would ask them to follow the stock piping, but go up to a 2" pipe vs the stock 1.75" pipe (I understand the cats and resonator use a 2" pipe) and route it to the factory flange at the rear axle. From there, I'll probably bolt on a Tanabe Medalion or Nitto (plan to buy from Micro Image) as those two seem to be the quietest mufflers. How does that sound for an exhaust set-up?

I am not expecting oh-my-god gains in HP or anything, but hope to have a little of both worlds: improved HP while being able to retain (or improve) MPG.

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05-21-2014, 05:13 PM	#11
j-san Drives: 2010 5-door hatchback Join Date: Mar 2014 Location: MN Posts: 50	A question for you exhaust gurus: A search of the forum turns up conflicting reports of a freer-flowing aftermarket exhaust system improving/hurting MPG. Some said it improves MPG and power, others have said it hurts MPG, but improves power. Either way, it seems a better exhaust will improve power and possibly affect MPG. I drive with a fairly light foot and mostly on the highway and average 43MPG most days. My Yaris is stock, but I am open to doing an aftermarket exhaust, provided it doesn't sound like bad rice and seriously hurt MPG. I wouldn't mind the few extra HP for a little help in the passing lane. If I go aftermarket, I plan to leave the intake stock and drop in a K&N filter. Maybe a header is fine, but I plan to leave the cats and resonator intact and possibly add an additional resonator after the stock one. There is a local custom exhaust shop that can do the work and I would ask them to follow the stock piping, but go up to a 2" pipe vs the stock 1.75" pipe (I understand the cats and resonator use a 2" pipe) and route it to the factory flange at the rear axle. From there, I'll probably bolt on a Tanabe Medalion or Nitto (plan to buy from Micro Image) as those two seem to be the quietest mufflers. How does that sound for an exhaust set-up? I am not expecting oh-my-god gains in HP or anything, but hope to have a little of both worlds: improved HP while being able to retain (or improve) MPG.