interesting day I am coming home from the doctor. I see but a wreck just around the corner from my house.It is a park avenue ultra so I think I might find it in the local yard and get the motor and tranny for my l67 swap. The exhaust manifolds should be the same right.

I was looking and curious in the exhaust on a 02 sle is the pipe after the cat 2.25 or 2.5 to the y. I know from the y back is 2 inch.
I am looking for a cheap magnaflow cat and I looked at performancepeddler.com and another post was talking about the cat and the numbers don't jive.There was nothing for the h bodies on the site.
will a clogged cat kill my mileage and have a weird smell and make acceleration sluggish.

What could cause the car to pull either direction and the air in the tires are up. I am thinking an alignment and balance should fix it right I have heard these cars are picky
TIA

edited for punctuation

1. Yes. absolutely.

2. Yes, alignment issues will likely cause the pulling problems, if not, the mechanics should be able to find something when they are setting up for the alignment

readingyourpostisratherhardtodowhenyouuselittlepun ctuation

what is the part # for the before cat O2 sensor and is there a cheaper place then gmpartsdirect .com

The GM part number for the O2 sensor is 25312203. So far, no one has found a better/cheaper source for the GM parts. However, there are those who say the Denso O2 sensor will do as well. Autozone carries that as a special order part for $65. Part number for that is 234-4018.