Hello! A downpipe question?!

[Xcore]

Hi all, new here and current owner of a manual ed30 which I’m slowly adding mods for track, took it around Bedford in standard form and it was fun yet abit wobbly!
Since then Iv added kw v1s and a white line rear ARB which should hopefully keep the body roll under a tad more control.

I’m currently looking at upping the power as i have a miltek non res (don’t judge me I got it cheap as the standard box rotted out!) I’m looking at a 3in downpipe.
How horrifically loud will a non silenced decat be combined with my non res exhaust?
Also will it cause issues with the stricter noise restrictions on some tracks? I noticed track slag do a 3.5 silenced decat but it’s rather pricey!

Thanks

[colesey]

You could always knock the cats out of the OEM downpipe first as a freebie experiment.  Suggest trying precat only first as that gives decent gains in reducing back pressure for easier spool and lowering EGT (hence more timing advance), whilst also easily passing MOT and remaining quiet.