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SVT Shelby GT500
Valve clatter???
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<blockquote data-quote="jbice03" data-source="post: 13901814" data-attributes="member: 157599"><p>As soon as I replaced the magnaflow mufflers with the magnapacks the car ran terrible. In the upper RPM range the car would start spitting and popping and lose power. (I suppose it was pulling timimg) As soon as I took it to the guy to have it tuned he checked the plugs and said it looked like it may have been running a little lean but the plugs didn't look all that bad. I replaced the plugs added the JLT CIA, FRPP 65mm throttle body and had him tune it. The car runs much better and since I don't drive the car hard very often I didn't notice the sound I'm hearing now. If I add Lucas octane booster to a tank of gas the sound disappears. I use to have a chevy truck and if I put regular gas instead of premium it would make the same sound this is making when it was under a load.</p></blockquote><p></p>
[QUOTE="jbice03, post: 13901814, member: 157599"] As soon as I replaced the magnaflow mufflers with the magnapacks the car ran terrible. In the upper RPM range the car would start spitting and popping and lose power. (I suppose it was pulling timimg) As soon as I took it to the guy to have it tuned he checked the plugs and said it looked like it may have been running a little lean but the plugs didn't look all that bad. I replaced the plugs added the JLT CIA, FRPP 65mm throttle body and had him tune it. The car runs much better and since I don't drive the car hard very often I didn't notice the sound I'm hearing now. If I add Lucas octane booster to a tank of gas the sound disappears. I use to have a chevy truck and if I put regular gas instead of premium it would make the same sound this is making when it was under a load. [/QUOTE]
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SVT Shelby GT500
Valve clatter???
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