up grades

[daz the plumber]

hi .are the up grades worth doing , i mean with out doing any head work etc . im interested in changing the chip ,ive been told putting shorter trumpets in the plenum and having a larger air flow meter increases power.ive heard so much can be done but is it value for money for the power increase .ive seen shorter trumpets for sale ,but when asking the question to the seller said a larger plenim is required. . can any one give me advice thanks daren

[GreenV8S]

Talk to the people who supply the upgrades (V8 Developments, Austec, ACT, Joolz etc) and they will explain the options, what they do, what they cost. There's no one obvious weak link that you can 'fix' to suddenly unleash loads of power, but there are some well established upgrade packages that work well together. Whether it's worth the money only you can say. As a rough idea, if you're looking for modest gains then budget around £100 per BHP gain and you won't be far off. (You find some of the mods are cheaper than that, but somehow these things always seem to end up costing more than you though. I reckon £100/BHP is realistic.) If you are hoping for 50+ BHP gains you're probably looking for a replacement engine which puts the cost up a lot (the sky's the limit), but you do end up with a shiny new engine.