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My brother used to have a 2000 Chevy S10 Extreme 4.3liter. He had an Air Raid TBI Spacer, JBA headers, Borla Exhaust, K&N CAI, and Hypertech PP. This combination some how made his truck sound like the blowoff valve was being used, even though he didn't have a turbo. We would pull up to imports and vettes and stuff, and they would slow down (we were on the highway) and we would keep going b/c they thought he had a turbo. It would pppsssssssss and then they would disappear (good sight to see). I would get the TBI spacer, I think it is part of a good combination that works very well. hope this answers your question, if not go ahead and ask again (lol).
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