I was thinking about purchasing a complete exhaust system from Warpspeed including the Y pipe, cat, and cat back. 2 questions I have are:

1. There are two types of catalytic converters, "Heavy Loaded" and "hi flow" for the 4th gens. The difference being???

2. I've read the performance gains on the Y pipe, but I'm still curious as to how the exhaust will sound at full throttle and when just mall cruising. I'm not looking for the typical whine on a aftermarket rice burner setup. More just looking for a throaty exhaust note (that won't turn heads).

Suggestions/opinions?

 

I have a budget y pipe, stock cat, and a straight pipe to a "performance" muffler. It's quiet at idle and aggressive when I gas it (with minimal rasp)

 

What muffler are you using? Did you see any benefit to your budget y pipe in regards to MPGs? How much did u dpend on your y pipe?

 

i got it for $120 and i traded my stock muffler for this muffler. I'm not sure what it is but it isn't expensive. I saw probably 2mpg better in my car (has a cel so i'm fetting about 20mpg)

 

i bought the SS y and HFC combo from them. the pacesetter cat back is 2.25" (why not 2.5?) which is fine but its not t304 ss. i went on ebay and got myself an ebay special cat back with a fart can (t304) and replaced the gigantic 4.5" tip muffler with a vibrant stealth black 2.5" straight through.

you will get mild rasp on free revs standing still around like 4k rpm but under load there is never any.