ive spent around £1300 on alloys and bodykit including fitting and spraying...i'll have pictures very soon
Well if you want to make your car go
slower you sure are going about it the right way. I would imagine that even with a pipe and induction mods you're car will still be slower than it was when it was stock, (after all that weight that you've added). Basically on a normally aspirated engine you're only going to make your engine make
less power by adding a free-flowing induction and exhaust
unless you sort out the fuelling too as you will have just made it run leaner, (and standard engines nearly always run on the lean side anyway to get through emissions tests etc). Real question is can the stock ECU deal with the required fuelling changes it'll have to make after the induction changes will have changed everything?
Also there is the whole issue of the tuning of the induction. In a normally aspirated engine the length of the inlets and induction piping can have a very significant effect on power output. Generally speaking manufacturers are pretty good at getting it right and usually making mods to the inlet system will only result in a messed up power curve. If you gain more than 5% through the midrange or top end on a modern NA engine with just decatted pipe and induction kit I'd be amazed, and that's assuming you sort out the fuelling.
cuprablue