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Sent from my iPhone</div>
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<div><b>From:</b> <<a href="mailto:explore8@outlook.com">explore8@outlook.com</a>><br>
<b>Date:</b> October 15, 2016 at 10:30:51 AM CDT<br>
<b>To:</b> <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>
<b>Subject:</b> <b>Stutter at 4K rpm</b><br>
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<div><span>Two races ago I went off track and bent my exhaust pipe enough to break the welded joint near the muffler. In the interest of time, I cut the exhaust at the muffler and secured the pipe to the frame.</span><br>
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<span>At the last race, I noticed the car would backfire at deceleration which I am not surprised but I also noticed a stutter around 4-5k rpm.
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<span>At NOLA this weekend it is more pronounced and comes in when shifting hard from 3rd to 4th. After 5k, it clears up and pulls normally.</span><br>
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<span>It doesn't seem to be affected by turns and more related to full throttle vs easing into the gas.</span><br>
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<span>Backpressure from the loss of muffler or unrelated issues?</span><br>
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<span>1300 spitfire with single Weber 40.</span><br>
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<span>Sent from my iPhone</span></div>
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