1. Apr 27, 2014 #1
   

   Gregf

   Im having a new ss exhaust custom made this week, they use 2.5" pipe as standard but will use 3" for almost the same price.
   My car is remapped and de-cated, will that 1/2 inch difference make any performance difference what so ever?

    
3. Apr 27, 2014 #2
   

   Azagedon

   Bigger the better with turbo engines, i made 270bhp and 301 lb ft with a 3" system and 3" decat

    
4. Apr 27, 2014 #3
   

   Gregf

   I think the decat is 2.75" miltek, but I am swaying towards 3"

    
5. Apr 28, 2014 #4
   

   ashr26

   Whos making your exhaust mate anf how much if you dont mind me asking?

    
6. Apr 28, 2014 #5
   

   Gregf

   longlife £390 including jap tail pipes

    
7. Apr 28, 2014 #6
   

   Gray RSM Moderator

   Don't go for 2.5" I think that's the same as standard DIA.
   
   Or maybe standard is 2.25" can't remember.

    
8. Apr 28, 2014 #7
   

   MilosB

   Either way not as much noticable difrence as with 3"

    

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