Sidepipes--Want Your Perspective

[RedBarchetta]

Stentor, two more tips for you that many overlook:

1. While you have your pipes off the car and performing all that surgery, weld in an O2 bung on each collector (pointed at around 4 o'clock driver's side / 8 o'clock passenger's side, towards the inside of the car). Plug them for regular use (no one will see them at that angle). But they are always there and functional if you ever want to hook up a sniffer to tune for the proper A/F ratio. I'm still kicking myself in the fanny for not doing this simple mod while I had them out.

2. Check the side support straps/brackets and reinforce them with another strip of steel. Speaking for the SPF version, they are prone to cracking. Again, you have them out and apart...might as well beef them up here and there (and before you make them purty).



Regards,

-Dean

[Rare Iron]

Originally Posted by RedBarchetta

Stentor, two more tips for you that many overlook:

1. While you have your pipes off the car and performing all that surgery, weld in an O2 bung on each collector (pointed at around 4 o'clock driver's side / 8 o'clock passenger's side, towards the inside of the car). Plug them for regular use (no one will see them at that angle). But they are always there and functional if you ever want to hook up a sniffer to tune for the proper A/F ratio. I'm still kicking myself in the fanny for not doing this simple mod while I had them out.

2. Check the side support straps/brackets and reinforce them with another strip of steel. Speaking for the SPF version, they are prone to cracking. Again, you have them out and apart...might as well beef them up here and there (and before you make them purty).



Regards,

-Dean

O2 Bungs: Walker/Dynomax #88103. The plug for these is #35299. You can order these at any NAPA store.

[scottj]

Built my own exhaust from header flange to turn-out. 1-7/8 to 3-1/2 collector, w/tapered transition into a 3" x 18" perforated core straight through muffler, and 3-1/2" turn-out. I wouldn't do it again (too much work)... next time I would have somebody else build it, only with merge collectors.

Motor drives and responds to tuning same as with open exhaust. This is on a 430" motor with a very large solid roller, a single DP 4 barrel, and locked timing (670hp). Original sidepipes were Lobak spiral cores. Although quiet, throttle response was terrible. In fact, I ran more timing to compensate for the diluted intake charge caused by the excessive (for my combination) backpressure.


Re: "flapping noise" on decel; I dont have any with this system. But, FWIW, I have louvered baffles in a 2-1/4" pipe on my Harley and it "flaps" like crazy. Remove the baffles and it goes away??