slash920

hi is a remap required if i was to bell mouth the down pipe and take the middle box cat out. 2 cats out.

cheers.

slash920

or what about the middle box cat and back box.

thunder8

iTrader: (1)

if fully decating then yes .

other option is sports cat bell mouth and just a back box .

remeber your map will cost around £550

so do pf7 plugs ,air filter, uprated feul pump,and so on ..to get the best out off your £550 remap

328isport

iTrader: (6)

People do run full decats without a remap, A friend ran his RB5 like this for years, but probably not advisable.

If you don't want it mapped I'd say leave the stock downpipe in place, but stick your second decat pipe on and fit the rest of your cat back system, this is what I run at the moment, no issues

guinnessman2001

I ran fully decatted on my MY99 UK Turbo for five years.

Did 75k in that time and never threw up a check error light at any time.

Maybe I was just lucky.