i know this question been asked a thousand times, but i have been told not to bother with a dv on my 1993 impreza unless i go for something like a hks ssqv about 200quid, why would this be and why not a baileys or similar? next i have oe downpipe and 3.5" tail pipe with 2"pipe but burble is ok but not loud enough, if i change just centre sec will this help?