Yoshimura R&D
www.yoshimura-rd.com
| Stainless Steel/Aluminum Slip-on RS4 |
| Price: | $395.00 |
| Sound: | 101.3 db |
| Weight | |
| Muffler: | 5.2 lb |
This pipe felt like it made more power everywhere, was smooth like stock with better bottom and top. It sound tested a little loud and was similar sounding to the stock system on the track and to the rider but had top-notch looks.
| Full Ti/CF RS4 system |
| Price: | $895.00 |
| Sound: | 99 db |
| Weight | |
| Header: | 1.3 lb |
| Muffler: | 3.9 lb |
| System: | 5.3 lb |
Easily the most factory looking system (especially since this is what will be on the factory Honda race bikes) this was also the most racey system we tested. It has more everywhere and even gets a bit too aggressive if the track is slippery where it needs to be ridden a gear high. It allows the bike to rev out much quicker in a lower gear or pull a gear high with plenty of authority. It made the bike feel crisper everywhere and faster everywhere (a lot faster), if you can control it in the lower gears. It is a very responsive power delivery.
| Ti Header Kit |
| Price: | $429.95 |
| Sound: | 98.0 dB |
| Weight | |
| Header: | 1.3 lb |
This full titanium header slips onto the stock muffler and had all of our test riders feeling better throttle response with similar power on the bottom but from the mid on up it felt more powerful than the all-stock system. For those that thought the full-system or slip on was too much, this was just right.
Also available:
Stainless Steel/Aluminum RS4 Full System $595.00
Ti/Ti RS4 Full System $845.00Stainless Steel Header kit $229.95
94 db Insert Kit $29.95
It pulls for what seems like...
It pulls for what seems like forever and makes plenty on top
Pro Circuit
www.procircuit.com
| Full Ti/CF RS4 system |
| Price: | $895.00 |
| Sound: | 99 db |
| Weight | |
| Header: | 1.3 lb |
| Muffler: | 3.9 lb |
| System: | 6.0 lb |
This pipe put out a very smooth, easy-to-ride lengthy spread and boosted power all the way through the curve, all while being very respectful of the sound. It is quiet to the meter and quiet on the track. It pulls for what seems like forever and makes plenty on top, enough for one tester to claim, "sometimes I couldn't use all the power!" The pull is so good up top that it is very hard to get into the rev limiter. It gives the bike great throttle to rear wheel control and worked well on all surfaces.