A question...

I am about to fit a Magnex backbox and have been offered a centre section (with resonator) as well. Can anyone tell me how much power I could expect to gain from backbox alone versus backbox and decat centre section.

Any help appreciated.

 

Decat centre isn't gonna gain you much. It is probably sommat like 3 or 4 bhp. The biggest jump you're gonna get is the downpipe. This with the centre and back box could be worth up to 30 bhp or more.
Back to the original question - if the centre is at the right price it's worth doing.

 

yep

Iwill concur

I recently fitted a Magnex BB & Decat centre section with resonator

much better now

Stve