after hmming and harring for months now i finally decided it was time for a new exhaust. simple, 2.5" straight through, couple of mufflers to hush it a bit but keep a note.
to cut a long story short, the 2.5" has taken away some of (enough to be quite noticable) my pickup. what i dont get is how a 2.5" can get worse performance than the stock 2 1/14" one that had a blitz cannon on it and a aftermarket resonater (EPA )
in more detail, the new system, 2.5" catback, what looks to be a big f**koff resonator (about 40cm long? :S) to a single muffler in the back (apparently one they use on 5.0L commodores) feeding to twin medium sized tips. just below 2k revs, it has the distinct sound of a clapped out VN commodore .
im not happy anyway cos its way too loud, my exhaust dealer said the same, hence why havnt actually got a quote for the system as of yet, but i want to know why iv lost performance and what i can do to get it back and then some. i go back to the shop monday arvo to sort it out (getting a second muffler put in somewhere), so any ideas before then would be appreciated.
car in question is a bone stock SI R33 GTS25 non-turbo. RB25DE.
people have already said to put my cannon back on it to free it up a bit, its half tempting at this stage.
cheers