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Old japcrap cars gain 25bhp by opening up the exhausts as they are known to be very restrictive.

Modern day performance turbo cars dont see so much as they are a lot more efficient and opening up the exhaust too much may cause issues with not enough back pressure being produced. I had a 3'' Dp and sports cat fitted last week, although its helped top end, it seems to be more laggy down the bottom end.

Full exhaust system on our cars, probably 10-15bhp max. Your better spending your money on a remap where in the LCR's case, you can see improvements of 50-60bhp/100lbft
 
true, may save up for the remap. dont wana mess around with leon, I stick to my pulsar when i need to get to A to B fast.
 
I gained 18bhp from a Blitz NUR Spec Back box on a newage Impreza...only gained another 28bhp from a complete decat (3 of them!!) and custom remap:confused: :confused: :confused:
 
mr arosaracer has a magnex system/de-cat on his LCR and he's happy with it. i think he likes the sound of it popping & burbling on tickover, his car is already remapped