hey folks does anyone know if a bike can can be used as an exhaust on your car. If so is there any requirements, will it work on a astra mk3 1.4 cesaro (standard except pipercross induction kit). and will you see a change in power. any help would be gratefully appreciated.
best way to get most power is fit a 4 branch manifold and a full system with a bigger bore then standard and then a performance rear box and de-cat it you should see an increase of around about 10bhp depending on what system you go for but like nova said your car will fail an mot test if the cat is not fitted and even if you take the cat off after the mot you are liable for the car if you are stopped for a road side emissions test
has actually been done quite a lot
I doubt if you will get any performance gains though as a bike's exhaust bore is not that big
and lets be honest a 1.4 astra engine is not the ideal engine for tuning
cheapest option to get a real performance increase would be 50bhp shot of nitrous and an astra gsi brake setup
in my experience messing sround with exhausts and air filters on a small engine in a medium size car is a waste of time and money
I have been there and done it, and in the end spent more money than it would have cost to get the same car but a higher performance version
maybe on an engine with a very restrictive standard exhaust
if vauxhall ( or any manufacturer) could have given there engine a staright 10bhp gain through just the use of some slightly bigger diameter pipe they would have done.
just slapping a bigger bore exhaust on might give you 10bhp peak gain, but I would like to see the power graph for before and after