Your car tuning mistakes

obi_waynne

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Location
Deal, Kent UK
Car
A3 1.4 TFSI 150 COD
Have you ever fitted a part or upgrade to your car but regretted it?

What did you do to correct this mistake? Why was this upgrade a bad idea?
 
This isn't so much a regret but I was surpirsed when I got a 3" test pipe to replace my 2nd cat and it DEGRADED performance. It is due to the terrible 2.25" OEM exhaust system and the restrictions further down the line causing the now-3" open test pipe to act as an expansion chamber, kill flow and degrade performance. When I upgrade to a full 3" resonated straight pipe in a couple months I am confident that the upgrade will be worth it and performance will increase quite a bit.

The OEM mid-pipe (after the test pipe before the catback) constricts down below 2" at one point where there's a huge pinch. At least the test pipe permts for some impressive pops and bangs :rofl:
 

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