Back-pressure Issues

Common issue when installed too free flowing of an exhaust on a vehicle. You haven't lost the torque, it just shifted to higher into the RPM range giving you top end power.

Great for a race car, not so much for a street car.

A set of aftermarket gears can help with the issue if you don't want to change the exhaust, but for the most part, adding cats or mufflers will bring back some of that low end torque at the sacrifice of top end power. Really up to you what you want. A lot of people toss in 4.10's or higher gears anyway.

A tune may or may not bring it all back.

You need a complete tuned exhaust system if you're going for best possible exhaust scavenging.