GAIN MORE POWER ASTRA J 2.0 CDTI ECOFLEX ELITE 165BHP

[marcus]

Generally speaking the only exhaust bits you are likely to see any benefit from are a different header or downpipe assuming the engine will respond to that. Cat back exhausts have very limited pay back considering the cost. Unless of course you have other engine mods and the exhaust is holding it back.

Free flow exhausts tend to over promise performance improvements. I've never really been impressed with any them I have had on the various cars I have owned.

Golf GTi mk1
Golf GTi mk2
Astra gte mk3
Astra G 1.6
Focus 2.0


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The only time I have noticed a difference in performance on exhaust work was on my old Saab 9000 Aeros and that was by fitting a 3" downpipe along with a 3" system, which massively reduced turbo spool up time

Other than that, generally fitting a sports exhaust can give a more pleasant sound (on petrols), which you probably think gives you more power, when in fact you are probably driving harder, because of the more "sporty" sound

Exactly, Good example of downpipe heaven is a golf 5 GTi where you can get an extra 70-80 nm by swapping out the downpipe. Sadly mine were all N/A so no good gains to be had.......except my focus where I my cat got blocked and couldn't afford the 1600 quid to replace it. Ended up removing the whole exhaust and replaced it with a 4-2-1 manifold and powerflow exhaust and added a Bluefin remap. Good gains on that motor considering it was N/A

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