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I have pretty much all access to a dyno shop, so when it comes to testing things for power I can get more than butt-dyno confirmation almost instantly. Yesterday I had the muffler shop cut out the resonator in my `16 2.0 and run a straight segment of pipe. Figured "eh, the resonator is completely pass through anyway, might as well open up the sound a little". Well, it felt a little doggish when I left the muffler shop, but I chalked it up to being tired (me, no the car). Drove it around a bit last night, still felt lame. Ran it on the dyno today.....
Lost 14ft/lbs!!! Yeah, it picked up 3hp and moved the whole power band up (a lot), but it lost torque across the entire rpm range, and given torque is what actually gets the car moving, and it`s hard enough to get torque out of a 2 liter engine, I had the resonator reinstalled right away. Guess, what? The torque is back.
It might not make a difference on an un-tuned car. On mine, with roughly 29ft/lbs more than stock, it was a kick in the balls.
Years ago Stillen built an 1100hp 300ZX that was loaded with all this high rpm HP stuff. Steve got in it and drove it, and said it was nearly undriveable when he got back. It made such little torque that it could hardly get itself moving. Of course once it got to 6K rpm it hauled ass LOL.
The point and conclusion? Keep the resonator, keep the torque. Yes, it sounds louder and throatier without it, but the performance suffers. I wouldn`t have believed it made such a difference if I didn`t have real world proof with my own vehicle.
Lost 14ft/lbs!!! Yeah, it picked up 3hp and moved the whole power band up (a lot), but it lost torque across the entire rpm range, and given torque is what actually gets the car moving, and it`s hard enough to get torque out of a 2 liter engine, I had the resonator reinstalled right away. Guess, what? The torque is back.
It might not make a difference on an un-tuned car. On mine, with roughly 29ft/lbs more than stock, it was a kick in the balls.
Years ago Stillen built an 1100hp 300ZX that was loaded with all this high rpm HP stuff. Steve got in it and drove it, and said it was nearly undriveable when he got back. It made such little torque that it could hardly get itself moving. Of course once it got to 6K rpm it hauled ass LOL.
The point and conclusion? Keep the resonator, keep the torque. Yes, it sounds louder and throatier without it, but the performance suffers. I wouldn`t have believed it made such a difference if I didn`t have real world proof with my own vehicle.