2 Q questions

[1qckser]

How much does a set of old 02 sensors hurt performance/ gas mileage? And im looking for a muffler to replace the current setup I have on my Q, I have removed the stock muffler and ran 2 1/4 pipes into 2 seperate resonators into two 3.5 resonated tips, it sounds good but at high rpms it gets a raspy sound, I want to deepen it up a little but still have straight thru design, any suggestions would be nice, Thanks

[AZhitman]

Dual in/dual out (2.5") Ultraflow. Fits in the stock location, straight-thru design (I think Dennis recommends). I can get it locally for around $115 or so, stainless for $144.

Model #'s : 17231 or 17515.

[1qckser]

Thanks AZ, how does it sound? The SR20DET guys are complaning about the sound of my car, I told theme that if you didnt end up behind me then you wouldnt know what it sounds like, hahahahahahaha:D

[AZhitman]

LOL - You'd have to ask Dennis. I think he has this mod.

Historically, the Ultraflow has a nice deep sound. On the Q, I'm betting it'll sound a bit like a similarly-sized Detroit engine. Perhaps like a 4.6l 'Stang...

[Q45tech]

Totally dead [or very slow switching] O2 sensors could decrease steady cruise mileage by 10% or 2-2.5 mpg.