1) So, if I understand correctly ther is NO exhaust system that can give torque to the entire rpm range (mainly below hp peak) AND add a few ponies to the peak point.[/QUOTE]
Some aftermarket exhaust systems increase torque throughout the powerband and also increase peak power. Torque is the force that actually moves the bike and horsepower is a mathematical function of torque which represents the amount work done relative to time. Most header/collector systems offer power increases in multiple ways. Some of those ways have systemic effects on power. By "systemic", I mean those gains that are spread across the entire powerband, not just the low, mid, or high RPM ranges. For example, replacing a stock exhaust that has sharp tube bends with an aftermarket exhaust with much milder bends will typically yield gains across the entire powerband because the sharp bends are a systemic pumping loss affecting the whole powerband. When pumping losses are reduced thoughout the powerband, torque (and hence horsepower) increase throughout the powerband since torque and horsepower are inseperably related.
2) Which is the full exhaust system that YOU would recommend for more torque and what are the mods on ecu and/or shafts that would be necessary? I am talking particular here, so if you don't want to "expose" your preferences to common view, I will understand.[/QUOTE]
I am biased in favor of BDE exhausts (not because I sell them--it's the other way around). I am thusly biased because my extensive, comparative research led me to BDE as a leading system based upon overall performance gains, construction, weight, appearance, and relative cost. That is why I sell them...exclusively. There are other good systems too (Yoshimura, Muzzy, Akrapovic, etc.) but I determined that BDE offered the most for the least investment. Each has its pros and cons. There are also some exhaust systems that are very marginal in terms of performance but some people choose them because of their sound or appearance. At the risk of offending someone, D&D comes to mind. There are "cosmetic" exhausts and there are performance exhausts. With performance exhausts, form usually follows function and loudness is not a measure of power.
Weight of the standard system IS an issue! (..along with the heavy wheels, but that's another issue altogether..). I am willing to go for a full exhaust 41 system just for the less weight benefits alone. The HMF's I particularly liked but they use two cans. Should I "trade" the extra weight of the HMF's for the lighter single-can system, and how can I preserve the TORQUE (this is what I 'm after, couldn't care less about more "peak" hp power, too dangerous here in Greece to ride on those rpm ranges.. (..oh, well, occasionally maybe.. )[/QUOTE]
If maximum performance is your main criteria, skip the twin muffler systems and enjoy the benefits of a lighter 4-2-1 or 4-1 system.
The possible loss of low RPM torque with a maximum exhaust system is a complex and sticky issue. The answer is... it depends (on several things)! I'll try to get back to this issue soon when my head is clearer. I've been awake way too long.
Later.....
Some aftermarket exhaust systems increase torque throughout the powerband and also increase peak power. Torque is the force that actually moves the bike and horsepower is a mathematical function of torque which represents the amount work done relative to time. Most header/collector systems offer power increases in multiple ways. Some of those ways have systemic effects on power. By "systemic", I mean those gains that are spread across the entire powerband, not just the low, mid, or high RPM ranges. For example, replacing a stock exhaust that has sharp tube bends with an aftermarket exhaust with much milder bends will typically yield gains across the entire powerband because the sharp bends are a systemic pumping loss affecting the whole powerband. When pumping losses are reduced thoughout the powerband, torque (and hence horsepower) increase throughout the powerband since torque and horsepower are inseperably related.
2) Which is the full exhaust system that YOU would recommend for more torque and what are the mods on ecu and/or shafts that would be necessary? I am talking particular here, so if you don't want to "expose" your preferences to common view, I will understand.[/QUOTE]
I am biased in favor of BDE exhausts (not because I sell them--it's the other way around). I am thusly biased because my extensive, comparative research led me to BDE as a leading system based upon overall performance gains, construction, weight, appearance, and relative cost. That is why I sell them...exclusively. There are other good systems too (Yoshimura, Muzzy, Akrapovic, etc.) but I determined that BDE offered the most for the least investment. Each has its pros and cons. There are also some exhaust systems that are very marginal in terms of performance but some people choose them because of their sound or appearance. At the risk of offending someone, D&D comes to mind. There are "cosmetic" exhausts and there are performance exhausts. With performance exhausts, form usually follows function and loudness is not a measure of power.
Weight of the standard system IS an issue! (..along with the heavy wheels, but that's another issue altogether..). I am willing to go for a full exhaust 41 system just for the less weight benefits alone. The HMF's I particularly liked but they use two cans. Should I "trade" the extra weight of the HMF's for the lighter single-can system, and how can I preserve the TORQUE (this is what I 'm after, couldn't care less about more "peak" hp power, too dangerous here in Greece to ride on those rpm ranges.. (..oh, well, occasionally maybe.. )[/QUOTE]
If maximum performance is your main criteria, skip the twin muffler systems and enjoy the benefits of a lighter 4-2-1 or 4-1 system.
The possible loss of low RPM torque with a maximum exhaust system is a complex and sticky issue. The answer is... it depends (on several things)! I'll try to get back to this issue soon when my head is clearer. I've been awake way too long.
Later.....
