Don't worry , I know a little about scavenging and pulse tuning (not much though
![Stick Out Tongue :p :p](/styles/default/xenforo/vbSmilies/Normal/tongue.gif)
). There is a an awful lot to think about with the exhaust system, be it optimising exhaust gas flow rates, backpressure, scavenging and the gas pulses exhausted into the system.
But I doubt some of these aftermarket manufacturers have put much thought into it to be honest and just take a standard design, play around a little to get some good dyno figures, then stick their name on it and flog it for £££.
And unfortunately many people buying such so called 'upgrades' for their exhaust just think: 'Larger OD" = Less Restriction = Better Flow = More HP' and you cannot explain the complexities to them as they know best
Looking at getting a nice new system on my Teg in the coming months and to get the Comptech mani on to replace my UKDM POS! Still a bit buy and bolt on, but I'll be doing some calcs and speaking with the man building the system as part of the group buy so we can get a good system at a reasonable price for the forum users. It's never going to be perfect for everyone, but my car is being used as the pilot/jig so it's all gravy
Pop along into the 'repacable carbon silencer thread' on itr-dc2 if you're interested.