Universal Muffler And Oil Type, Hopefully this is in the right place lol Options

[mariosdarkworld]

Ok well i was looking at my exhaust system looks like i have two cats. Im guessing idk. Does everyone that owns an st have this weird thing that looks like a cat (sorry not to familiar with them) it goes right after the header. Anyhow i live in AZ so I dont need two I only need one. My question is what is a good size tubing for this vehicle and whats a good but not to loud muffler cause i was thinking MagnaFlow and 2.5 tubing.... Magnaflows pretty inexpensive and i heard it on youtube so i think i may go with that but i am open to suggestions
Next question is it says to use 5w-30 on the manufacture specs but this car is old and has 163k so I was told to use 10w30 in the winter and 10w40 in the summer. What are your guys opinion?? sorry, i know i typed alot just thought it was necessary lol P.S. It gets like 115F here in AZ for normal temp during summer:(

[jason]

i believe all st's are california spec. i may be wrong though. thats why you have 2 cat's

and he's pretty much right on with the exhaust piping.

not much performance will be gained anyway, so might as well just get a muffle put on for sound n looks n call it a day saving $$$

10w 30 of descent quality oil (aka $12+ for a 5qrt bottle, not the $0.30 per quart special) should be good enough. i say get better quality because the cheap stuff burns off and is horrible in heat. dont go with thicker oil as will just strain the pump

This post has been edited by jason: Mar 13, 2008 - 1:21 AM