Alfa Romeo Forum - View Single Post - De-catting

Pud237 · 05-02-2008

I'm off to Powerflow in the morning to ask their advice on getting a de-cat pipe made up for my 156 V6. It currently has a SuperSprint backbox and a new mild-steel centre pipe. There is only one lambda probe (1998 V6), which is before the cat, so technically removing the cat shouldn't cause any ECU issues. Obviously it will go back on for MOT testing..

Couple of questions:

1) Will I notice much in noise/boom from the exhaust? Now the cat on the V6 is massive, it looks more like a silencer, is there a silencing effect "built in" to the cat?

2) Will I lose back pressure and therefore lose torque low down in the rev range. This isn't ideal as I come from a JTD and the V6 does lack torque for my liking..

3) Will I notice any significant power gains top end?

Cheers,

Dan

05-02-2008	#1 (Post Link)
Pud237 AO Platinum Member Join Date: Apr 2006 Location: North Yorkshire Posts: 13,566 Member car: Alfa 156	De-catting I'm off to Powerflow in the morning to ask their advice on getting a de-cat pipe made up for my 156 V6. It currently has a SuperSprint backbox and a new mild-steel centre pipe. There is only one lambda probe (1998 V6), which is before the cat, so technically removing the cat shouldn't cause any ECU issues. Obviously it will go back on for MOT testing.. Couple of questions: 1) Will I notice much in noise/boom from the exhaust? Now the cat on the V6 is massive, it looks more like a silencer, is there a silencing effect "built in" to the cat? 2) Will I lose back pressure and therefore lose torque low down in the rev range. This isn't ideal as I come from a JTD and the V6 does lack torque for my liking.. 3) Will I notice any significant power gains top end? Cheers, Dan Back on the road: Alfa 156 3.0 24v V6, Silver with red leather, Q2 diff, GTA Teledials, headlights & inlet manifold, AutoDelta carbon intake, decat pipe and SuperSprint rear box, FK coilovers, Dastek Unichip - my 245bhp beast! Gone but not forgotten: Alfa 156 2.4 JTD Veloce, Vela Blu, Angel 'mad map' & BMC CDA, Ferodo DS2500s - the fastest tractor in town! AO 'Bratpacker' No 5.