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Theres a few slightly larger IC's available on eBay. How much better it will be I am not sure. They are fairly cheap too so the hip pocket hurt wont be as bad as buying top dollar ARE or Cross Country cooler. Plus I am pretty sure that a bigger IC wont help with the lag you speak of. It may but I am not sure. I would get the truck dyno tuned. Probably the best thing for you to do next I would guess. As on the dyno they can try to tune out this lag, and even give you better advice on what to do.