get rid of the air box for loud s.c and run a shorty or a cai you will wake the noise up I was also wondering about the pump I have had 2 different headers (o.e and mikes longtube for the 203 on mine ) and replaced the exhaust stuff under the headers and I still have a leak somewhere under load and frankly its pissing me off ive had the entire head off pressure checked, decked, valve seals you name it it was replaced .... ported and polished too