built a custom 2.5" mandrel bent exhaust in my friend's driveway
#1
built a custom 2.5" mandrel bent exhaust in my friend's driveway
I finally got a 2.5" mandrel bent exhaust on my car....
The materials:
2 mandrel u-bends
3 exhaust hangers
1 6" flex pipe
8ft straight pipe
2 2.5" 3 bolt flanges
[already had the Techtonics Tuning HFC]
Total Cost (not including cat): $130
(plus a 3" exhaust tip left over from my friend jerd's exhaust)
Originally the plan was to make a new downpipe off of the cat, and then the rest of the exhaust after a flex pipe and another flange to take it off in 3 pieces from the turbo back. We decided Audi was stupid in making the cat/downpipe connection in the hardest spot to reach (which, according to jerd, is why audi mechanics get paid so much)... so we chopped the flange off of my month old cat and welded up a real one piece cat/downpipe, moving the flange down to a reasonable level.
After the downpipe there is a 6" flex pipe, then a 4ft straight pipe... and then jerd worked his magic in the rear end and routed the exhaust around the rear diff and out the back, which let us center it perfectly.
When I had the turndown off of my stock 2.25" downpipe, I measured 95dB under load in the driver seat. Now I'm getting 88dB under the same conditions. (on an iPhone SPL meter, not accurate but it's consistent)
The car has less of a boost spike around 3k now, but if feels like it has more power throughout the rpm range. THANKS JERD!
pics:
video:
http://vimeo.com/8745582
97dB max during the video at 35ft. I think california's limit is something like 95dB at 50 ft, and the SCCA limit is 93dB @ 50ft, so I may need a muffler at some point. I love the sound though.
The materials:
2 mandrel u-bends
3 exhaust hangers
1 6" flex pipe
8ft straight pipe
2 2.5" 3 bolt flanges
[already had the Techtonics Tuning HFC]
Total Cost (not including cat): $130
(plus a 3" exhaust tip left over from my friend jerd's exhaust)
Originally the plan was to make a new downpipe off of the cat, and then the rest of the exhaust after a flex pipe and another flange to take it off in 3 pieces from the turbo back. We decided Audi was stupid in making the cat/downpipe connection in the hardest spot to reach (which, according to jerd, is why audi mechanics get paid so much)... so we chopped the flange off of my month old cat and welded up a real one piece cat/downpipe, moving the flange down to a reasonable level.
After the downpipe there is a 6" flex pipe, then a 4ft straight pipe... and then jerd worked his magic in the rear end and routed the exhaust around the rear diff and out the back, which let us center it perfectly.
When I had the turndown off of my stock 2.25" downpipe, I measured 95dB under load in the driver seat. Now I'm getting 88dB under the same conditions. (on an iPhone SPL meter, not accurate but it's consistent)
The car has less of a boost spike around 3k now, but if feels like it has more power throughout the rpm range. THANKS JERD!
pics:
video:
http://vimeo.com/8745582
97dB max during the video at 35ft. I think california's limit is something like 95dB at 50 ft, and the SCCA limit is 93dB @ 50ft, so I may need a muffler at some point. I love the sound though.
#8
Yeah, you threw away a ~$230 Techtonics Tuning High Flow cat. LOL. I actually picked that one because it looked the closest to stock.
#9
I'm actually up in Redding, CA right now for christmas, it's a friend up here who did the welding for me. I told another guy on Audizine that I'll try and find someone willing to do some welding in SD and make some down there... or maybe i can get my friend from Redding to drive down for a weekend and fab up some exhausts for cheap.
#10
hey now i happen to like my "crappy" tail lights, i like them better than the other ones actually