Claviger
Aspiring Student
- Joined
- Jul 25, 2014
- Messages
- 6,934
- Location
- Olympia Washington
- Ride
- '21 Z H2, '14 R3R, '02 Daytona 955i
Just to clarify for those interested.
CES primary tube are 1.75 diameter.
When referring to 2 and 2.25 diameters, they mean the diameter after the collector. 2.25 vs 2 after the collector will effect noise a bit and to a significantly lesser degree than the primary dimensions the torque curve. The larger diameter should slightly shift the torque upwards in RPM. This small diameter change will be hardly noticeable on a stock motor bike if at all, but, as power increases, the effect will grow and be more distinct.
The difference with primary diameter from 1.75 to 2 and primary length will have a more pronounced effect on the shape and width of the torque curve, but the ability to manipulate it will fall within a certain range, determined by the flow characteristics of the head, cams, and ignition timing.
2" primaries will allow for more power up top if the motor can flow enough to gain from the extra size. This is somewhat observable with the stock motor, but, like diameter after the collector, the effect will be much more pronounced with a built motor, especially when increasing RPM limits.
Primary length, is what will help you spread the width of the torque curve and tuning it properly will allow you to use a larger diameter without sacrificing lower end torque. This can be observed with all three top Rocket exhausts, Reband, CES, and Carpenter. All three shops are well versed in exhaust design, and as a result all three products work very well, but achieve their goal differently using different Primary diameters, lengths, and differing post collector design.
I agonized for a long time about which to buy, and it the end based me decision on cosmetics ....lol. Keep I'm mind the sidewinder wasn't released then.
The main considerations, beyond shop preference, should be IMHO future plans.
CES will fit with the Rotrex super charger kit but it's tight.. The primary tubes go too far forward for good clearance imho. They are smaller primary diameter but longer length, meaning they should widen the torque curve on a stock motor and sacrifice a little bit up top for a little bit on the bottom.
Reband and Carp are 2 inch primaries that are shorter (They all pass through a 1.75" section, but Carps flare back out to 2") thanks @Neville Lush for the correction. They fit with the SC kit, and if you plan on making much over 200whp, you will see larger gains vs keeping CES, BUT the CES can still make very good power on built motors.
I would suggest considering future upgrade path, price, looks, and sound as the most important considerations. Performance is there from all three, as is quality, and customer service.
It's really a win win no matter which you buy, all perform well and fit better than original.
CES primary tube are 1.75 diameter.
When referring to 2 and 2.25 diameters, they mean the diameter after the collector. 2.25 vs 2 after the collector will effect noise a bit and to a significantly lesser degree than the primary dimensions the torque curve. The larger diameter should slightly shift the torque upwards in RPM. This small diameter change will be hardly noticeable on a stock motor bike if at all, but, as power increases, the effect will grow and be more distinct.
The difference with primary diameter from 1.75 to 2 and primary length will have a more pronounced effect on the shape and width of the torque curve, but the ability to manipulate it will fall within a certain range, determined by the flow characteristics of the head, cams, and ignition timing.
2" primaries will allow for more power up top if the motor can flow enough to gain from the extra size. This is somewhat observable with the stock motor, but, like diameter after the collector, the effect will be much more pronounced with a built motor, especially when increasing RPM limits.
Primary length, is what will help you spread the width of the torque curve and tuning it properly will allow you to use a larger diameter without sacrificing lower end torque. This can be observed with all three top Rocket exhausts, Reband, CES, and Carpenter. All three shops are well versed in exhaust design, and as a result all three products work very well, but achieve their goal differently using different Primary diameters, lengths, and differing post collector design.
I agonized for a long time about which to buy, and it the end based me decision on cosmetics ....lol. Keep I'm mind the sidewinder wasn't released then.
The main considerations, beyond shop preference, should be IMHO future plans.
CES will fit with the Rotrex super charger kit but it's tight.. The primary tubes go too far forward for good clearance imho. They are smaller primary diameter but longer length, meaning they should widen the torque curve on a stock motor and sacrifice a little bit up top for a little bit on the bottom.
I would suggest considering future upgrade path, price, looks, and sound as the most important considerations. Performance is there from all three, as is quality, and customer service.
It's really a win win no matter which you buy, all perform well and fit better than original.
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