I bought a single box centre exit 1.75 Maniflow stage 1 with a cone filter at L2B, can't wait to fit it!
I wanted noise mainly, thats why i got the single box and cone (instead of just an element). What differences am i likely to get? Can i expect much more power from an otherwise standard 998?
I have the same setup but mine is a side exit. Its quite loud but not overly. It needs about 3500 revs before you start to hear it. My mate has the same kind of thing, but a 2" backbox and it makes a big difference to the amount of noise you get! Admittedly mine is great when you don't want noise, in 3rd and 4th around town not booting it its barely audible, apart from a nice deep Buuuurrrr when you intitially press down on the gas.
If its a stage one kit you'll get a big difference. I noticed with mine it was great up hills, actually pulling really well. The engine as a whole is way more responsive and quicker with the increased torque. There is a stretch of road where everyone used to burn up until they put mobile speed vans there. I used to hit 55, 60 max... can do 70 up there now. hehe. damn speed vans though.
Make sure you put everything on all in one go... otherwise you wont feel the benefit. Admittedly its much better than standard but you get used to it... I want more power now and I find it lacking sheer grunt. its nippy, but not fast. Defo worth the outlay though.
To give you an idea of comparitive speed - my friend got a courtesy car from ford, a brand new 1.25 zetec fiesta.. and we were level until 70, then he was pulling a way, the 1.4's *yellow human water* over me, sob sob.
Hope that helps! TML