I recently put a slip-on muffler on my sport bike (1000cc 4cyl 4-stroke) and picked up a little power at the top end but lost some bottom end torque. From what I've read, this is common with less restrictive exhaust, gains at the top rpms and loss at the lower rpms. The tC is a 2400cc 4cyl 4-stroke so I'm wondering if the same holds true.

I also read that the stock tC muffler has some sort of valve built in that opens under hard acceleration and/or increased exhaust flow. If this is true, it's hard to imagine that Toyota would go to the expense of an valved muffler only for noise suppression, maybe it's also to improve bottom end torque??

Has anybody who has changed their exhaust to the TRD unit noticed any drop in bottom end grunt?

Thanks

 

I have the exhaust, and i can feel no loss of power anywhere throughout the powerband.

 

Just had the trd exhaust put on my TC this weekend. Haven't noticed any loss in power. It almost feels like I have picked up a little boost. Car seems to run a little smoother and it sounds really good. Awesome mod for this car.

 

You shouldn't lose any bottom end with a slip on, for your bike, ussually you will lose it with a full system, get a power commander and some dyno time, and you should find at least a three hp gain across the board.(three hp and a better sound for around 400 bucks, amazing what exhaust companies charge, craziness!!!)

 

didnt notice any power gain or loss still the same sounds a lot better tho

 

Yes there is a valve that opens when enough backpressure is there. Yes you will lose some bottom end. The main thing though is its a big engine. So you wont notice it. I would say you lose maybe 1hp up until around the 1500rpm range. From there your back to normal & once over 2300 or so your starting to build more power then stock. About the only real way you will notice a big drop in power is if you put a straight pipe from the manifold/catilytic converter setup.

 

Thanks to all for the info, it's what I was hoping to hear.