Hi I have a gb270 and would like it to make a more noticable (subaru)exhaust note. I have been told I would get a better sound if I removed one of the cats, the first one I think? I was also told that it would still pass the MOT emisions test is this true? An alternative would be to replace the back box with some thing like the Vortex afterburner but if pos I would rather not because the origonal is a prodrive exhaust?

thanx all

 

Replacw the resonatwd centre aection with a straight thru item. Plenty to choose from. Hayward and scott do a good one

 

If you want that 'Subaru' sounds I think the Backbox and centre pipe would be the first to go. The prodrive pipe is VERY quiet. Try an Afterburner, Blitz, Ninja or H&S backbox with a de-resonated centre pipe (if the GN270 doesn't have one already.)

If that's not enough then start looking at the Cats.

 

Ive had a few straight through non resonated centre sections and they are definetly louder but I found that at motorway speeds the drone was too much. I swapped the centre section for a H&S silenced centre section and the tone was alot deeper and sounded better with the offbeat tone being more pronounced and the drone greatly reduced on the motorway. Still roars when i boot it though

 

if i replace the resonated centre section with a straight through one will it still pass an MOT?

 

Yeah mate it will be fine, it's just a resonator and not a CAT so emisssions will be fine as will noise levels for MOT.

 

Got two resonators on my center section and while it's loud with foot down and general low and mid rev grumble, motorway drone is minimal.