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<blockquote data-quote="Sinister04L" data-source="post: 9001293" data-attributes="member: 8435"><p>I got my built engine from a guy who had it in his truck for 2 months before a business opportunity came up and he needed to sell his truck. I swapped my stock engine for his built one. He was running the Comp R exhaust system with no cats. I was running Kooks LT's, highflow cats, and a Bassani BX catback. We both ran the same pulley configuration (8# lower, 3.25 upper), he had no cats, I had highflows, and he ran 12* timing, I ran 10* timing. The same engine, on the same dyno, tuned by the same tuner. He made 613/670, I made 614/674. So with the same boost, but him with no cats and more timing, the numbers were almost identical. The Comp R system gave him nothing over my set up, and might have even cost him a little bit. This is on a built engine/ported heads/cams combo. If it's not going to pick up anything there, running it on a stock engine certainly won't pick up anything. That's my 2 cents. </p><p></p><p>Jeff, there's no point in even running a Whipple if you're only going to spin it to 11psi. They really pick up once you start spinning them and get them into their efficiency range. With a 2# lower and 3.25 upper I made 501/582 on pump gas. You don't have to be that aggressive since you don't want to risk blowing your engine, but you don't have to turn it down that much.</p></blockquote><p></p>
[QUOTE="Sinister04L, post: 9001293, member: 8435"] I got my built engine from a guy who had it in his truck for 2 months before a business opportunity came up and he needed to sell his truck. I swapped my stock engine for his built one. He was running the Comp R exhaust system with no cats. I was running Kooks LT's, highflow cats, and a Bassani BX catback. We both ran the same pulley configuration (8# lower, 3.25 upper), he had no cats, I had highflows, and he ran 12* timing, I ran 10* timing. The same engine, on the same dyno, tuned by the same tuner. He made 613/670, I made 614/674. So with the same boost, but him with no cats and more timing, the numbers were almost identical. The Comp R system gave him nothing over my set up, and might have even cost him a little bit. This is on a built engine/ported heads/cams combo. If it's not going to pick up anything there, running it on a stock engine certainly won't pick up anything. That's my 2 cents. Jeff, there's no point in even running a Whipple if you're only going to spin it to 11psi. They really pick up once you start spinning them and get them into their efficiency range. With a 2# lower and 3.25 upper I made 501/582 on pump gas. You don't have to be that aggressive since you don't want to risk blowing your engine, but you don't have to turn it down that much. [/QUOTE]
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