I know, I'm a broken record, but there are WAY too many stories of having to replace side-feeds around here. "I replaced one 2 yrs ago and now another", "I replaced 1 last year, now 2 are down" etc, etc. I hear it from Nismos, Nissans, and esp DW's. The worst part is that these side-feeds are dinosaurs that end up costing $110-$150 EACH. It's ridiculous. Get a top-feed, WINFactory is $625 (or $975 w/injectors) or you can go BDE for $1300 w/injectors and it comes with a replacement lower plenum. (no core) $50-$75 per injector sounds much, much better. (Plus you get AN fittings as a bonus!) Knock is likely doing serious damage to your engine, you don't want to continue doing that. (Plenty of destroyed piston pics around here.)
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