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I have installed two sets of ARH on L99 cars....They were awesome. Once tuned you will get the full benefit of the system.
In my experience you did not lose any TQ at teh bottom end by using the bigger tube...but the smaller tube may gain a little more on the bottom end.
That being said...in my experience, both were gains across the board, and I would use the larger tube so that if you do anything in the future you are not going to hav to buy new headers again.
Even just adding a Cold Air Intake will help with the bigger tubes....that is just my thoughts....If you need pricing or have any questions feel free to get in touch.
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