MrBluGruv
01-27-2010, 09:10 AM
Lately I've been kinda concerned about passing inspection as more and more push is being made to check emissions, and since I've got pretty much no emissions restriction hardware any more I feel I need to at least get back to passably legal. I figure while I'm down there hacking stuff up, I may as well do multiple things at once, but I have a few questions before I do:
1. It's been my understanding in the past that the front O2 sensors are present to measure AFR and such to control engine mixture, and the second sets are the ones designed to sniff and make sure the catalysts are doing their job, is this correct? And if so, following that logic I guess, would that mean to be legal I really only need to worry about having cats between the 1st and 2nd sets at least? when I got the first cats removed the guy was swearing a storm because of the difficult angle of those cats and the fact that my manifold flange bolts that connected them were slightly rusted, so I'd like to avoid that hassle if I can. Or if that wouldn't be enough, should I consider investing in high-flow cats to replace where all 4 stock ones were?
2. High-flow cats. From all I've seen they are essentially straight-through design yes? I want to avoid getting rid of the tonal quality and brashness that came from removing all my cats if I can, as the stock cats may as well be mufflers in and of themselves.
3. Electric cutouts. This is a much more subjective question, for anyone that's running cutouts on your MM or have run them on any of their cars, is there a particular brand that stands out to you? where would you recommend placement in the exhaust line? I do realize this isn't really a performance adder, and admittedly I'm doing this purely for the sound and volume, and with that I'm kind of curious for those that have them what kind of volume should I expect, and again where should i put them for greatest impact on volume?
Thanks guys, I'm pretty sure that's all I was curious about. I tried to collect my thoughts into one so I wouldn't spam post the board with stupid questions. :P
1. It's been my understanding in the past that the front O2 sensors are present to measure AFR and such to control engine mixture, and the second sets are the ones designed to sniff and make sure the catalysts are doing their job, is this correct? And if so, following that logic I guess, would that mean to be legal I really only need to worry about having cats between the 1st and 2nd sets at least? when I got the first cats removed the guy was swearing a storm because of the difficult angle of those cats and the fact that my manifold flange bolts that connected them were slightly rusted, so I'd like to avoid that hassle if I can. Or if that wouldn't be enough, should I consider investing in high-flow cats to replace where all 4 stock ones were?
2. High-flow cats. From all I've seen they are essentially straight-through design yes? I want to avoid getting rid of the tonal quality and brashness that came from removing all my cats if I can, as the stock cats may as well be mufflers in and of themselves.
3. Electric cutouts. This is a much more subjective question, for anyone that's running cutouts on your MM or have run them on any of their cars, is there a particular brand that stands out to you? where would you recommend placement in the exhaust line? I do realize this isn't really a performance adder, and admittedly I'm doing this purely for the sound and volume, and with that I'm kind of curious for those that have them what kind of volume should I expect, and again where should i put them for greatest impact on volume?
Thanks guys, I'm pretty sure that's all I was curious about. I tried to collect my thoughts into one so I wouldn't spam post the board with stupid questions. :P