puntobloke said:
I think you need to update yourself on what these exhausts actually do to the car,yes i do agree with you on your statement of what a chav will do to there car,however exhaust systems now can add anything upto 15bhp ontop of a 'normal' exhaust system depending on what you buy,the mentioned 'chav' like system actually added another 8bhp.
And is this quoted power gain the exhaust manufacturers claims or is there an independant report from a magazine(s) that has tested it on a rolling road comparing it with a stock system?
Sorry to be cynical, but I spent too many years involved with engine rebuilding as well as reading magazines such as Cars and Car Conversions, Street Machine, Fast Car, Custom Car, Classic Ford, Fast Ford etc. Too many times I saw them test so called performance parts such as exhausts/ induction kits/ manifolds only to find that compared with stock the power gain was hardly noticeable. In some cases cars were fitted with a number of performance parts and it was found that when tested power was LESS than the stock vehicle!
Also worth noting, that whereas in some cases an exhaust had increased bhp slightly (most often pushing the power curve further up the rev range), the TORQUE figure had dropped below standard. This in effect made the engine feel very peaky, and compared with a stock system felt like it was producing less power under normal road use because the stock system was more torquey.
It's also worth bearing in mind that an exhaust system, especially a modern type with a catalytic converter, needs to have the WHOLE system replaced for power increases, not just the back box. Changing the back box on it's own is unlikely to have any effect at all. Again, read the magazines that actually test these on a rolling road, and look at four cylinder cars that have been race prepped to see what a real performance system looks like. Believe me, they don't have four tailpipes!
Engine tuning is an all or nothing situation. If you want to fit a performace exhaust, then you need to do so from the exhaust manifold to the tailpipe. The manifold has to be complimentary with the cat, the mid section and the tail pipe and vice versa. But that on it's own is no good until work has been done on the induction side. More air/ fuel needs to go in, throttle bodies need to be modified, ecu units need to be remapped. Then of course you get into cylinder head work, where the valves may have to be increased in size, the camshaft needs greater lift and duration, the head needs to be ported and gas flowed etc.
So perhaps now you can see where I'm coming from, as there is far, far more to gaining horse power than simply slipping on a fancy exhaust back box.
Until I see a full rolling road test of this aftermarket exhaust compared with a stock system, I will keep a healthy degree of scepticism about it. Until I see proof that it is indeed a performance enhancing accessory, then it will for me be nothing more than a way of extracting money from people who are only getting a fancy tail pipe.
However, if someone wants it purely for it's looks, then that's fine. Personally I think it looks silly, but that's my tastes and obviously other people must like them else they wouldn't make them in the first place.
Saying that though, I think the fact that it was the least popular modification in the poll really did speak volumes about what the generally opinion is
