Dyno 3: HKS Hi-Power exhaust
Pros
As with most HKS products, fit, finish, packaging and presentation are second-to-none. As an added bonus, we gained a whopping 19.7 hp and 14.2 lb-ft of torque. This exhaust really unleashes the beast in this engine. The majority of the power came on from 3500 rpm through red line. The exhaust note is surprisingly tolerable for the 85mm piping. The stainless muffler canister is first-rate.
Cons
All the instructions are in Japanese but at least the pictures are easy to interpret. Although it has a sweet exhaust note some may find it a little loud, and there is no silencer included.
Notes
The installation was straightforward. The disassembly and reassembly went off without a hitch.
Tools
14- and 17mm combination wrenches, 14- and 17mm sockets, ratchet and WD-40
Parts
Muffler, B-pipe, gaskets, bolts, sticker and instructions
Installation time
45 minutes
Temperature
Air temperature at 71.5 degrees Fahrenheit
Temperature difference from previous run: -2.5 degrees Fahrenheit
2000 to 3500 HP range: -4 to 3
3500 to 5500 HP range: 0 to 15
5500 to red line HP range: 9 to 26
2000 to 3500 TQ range: -8 to 6
3500 to 5500 TQ range: 3 to 20
5500 to red line TQ range: 12 to 20
Peak HP: 187.8
Peak TQ: 182.1