I have the PowerAid TBS on my 99 xj 4.0L and I don't have a whistle at all that I can tell. It took my computer about 10-12 miles to re-adjust to the new air flow.
I have the PowerAid TBS on my 99 xj 4.0L and I don't have a whistle at all that I can tell. It took my computer about 10-12 miles to re-adjust to the new air flow.