XF_boy

Hi all,

What is the best option in fitting a new exhaust to a carby 4.1 petrol XF? 2.25 or 2.5 inch? And can someone please explain the term "back pressure" in relation to exhausts? I've heard that term thrown around a lot and don't know it's meaning.

Thanks in advamce gang

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xf351gt

dont go overboard on the size i have a xp with same motor
had extractors stock size pipes sports muffler staight though
job .

only need 2 1/2 on a v8 in my opinion.