Pros
The A'PEXi GT Spec exhaust is the exhaust to have if you want to make power with your MR2. Starting at just over three inches in diameter at the downpipe connection and tapering up to a massive four-inch tip, and utilizing a straight-through stainless steel muffler and piping, this exhaust can flow more than the 2-liter mill could possibly exhale. The fit and finish is top-notch and everything fits like a charm. A'PEXi was even kind enough to include high-quality gaskets in their exhausts.
Cons
Removing the stock B-pipe on a turbo MR2 requires removing a transmission mount, dropping the subframe about 10 inches and removing the sway bar mounts. We were fortunate to have a lift to do this on and had the whole thing done in about an hour (with two people). Without the overhead lift and a friend to lend a hand or two, it would take four times as long.
Parts
Muffler, B-pipe, gaskets, bolts, nuts, stickers and instructions.
Tools
12-, 14- and 17mm combination wrench, 12-, 14- and 17mm socket, ratchet and extension, heat-resistant gloves and PB Blaster.
Installation Time
60 minutes.
Notes
The A'PEXi GT Spec exhaust performed splendidly, netting us almost 20 hp and 20 lb-ft of torque across the board. It's all about how much power you can put under the horsepower/torque curves, and a quick glance shows an increase in power that can definitely be felt behind the wheel. After the GT Spec exhaust was installed, the car was producing about 11.5 pounds of boost, up from 9.5 with the stock exhaust. The increase in boost is a result of decreased pressure after the turbine and an increased pressure delta at the turbine exducer.
Dyno 2:
A'pexi Gt Spec Exhaust
PEAKHP 168.0 / PEAKTQ 178.0
Horsepower Gain
1500 to 3500 HP range: 1 to 10
3500 to 5500 HP range: 6 to 19
5500 to redline HP range: 17 to 20
Torque Gain
1500 to 3500 TQ range: 2 to 13
3500 to 5500 TQ range: 10 to 19
5500 to redline TQ range: 10 to 12