You can get adapters for 02 sensors for some ehaust manifold/riser designs. Plan to use them when my L31 from my Express ends up in my boat with the 0411 running it.
I have seen those, don't remember them being around when I did mine years ago.
My new boat has a TBI 350 in it stock, will do 55 MPH, and pulls anything I want behind it. I am leaving it alone...LOL
-1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
-2002 Cavalier, Tuned with HP Tuners
-1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)
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