Dibbles00

Hi,
Does anyone know what power the rear oem STI JDM silencer can make before it becomes too restrictive? Also does anyone know if the Milltek down pipe and centre section would correctly mate up to it?
Thanks,
Dibs

Part #

Downpipe = 3" Twin-Scroll Downpipe / MSSUB126
Centre section (De-CAT) = 3" Milltek / MSSUB132

If not this will be the other part to the exhuast:
Rear Silencer= 3" Milltek Impreza / MSSUB128

Rickfh

my 2004 jdm sti made 320/340 with just a decat and keeping the rest of the exhaust original and a uprated fuel pump

Dibbles00

Hi Rick, cheers for the reply. When you say "just a decat" so you mean just the downpipe or the centre section?
Thanks,
Dibs

Rickfh

Yes; just had the downpipe removed.

Dibbles00

Sorted. I was thinking of getting the full miltek system, but have heard it can become quite boomy. So I'm now just thinking of getting the decat twin scroll downpipe and centre section only. Will those two items mate up to the standard rear silencer? This is to keep OEM looks and reduce noise, but still give decent power when mapped.
Do you know when the OEM rear silencer becomes restrictive?
I had a super-charged civic and was told by Romain @ Eurospec (he mapped it) that the OEM backbox was good up to 350. So I kept it for OEM looks and a sensible noise level and only changed the manifold and B-pipe. I'm looking to achieve the same with the Impreza.
Thanks. I'm new to Imprezas and not sure what works best.