The off-road H-pipe will make them scream at a high rpm, don't worry. I was kind of disappointed in my Flows sound at high rpm too at first. But once I put my o/r X-pipe on, it was the sound I had always wanted. Just wait for monday buddy.
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1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, KVR front brake upgrade. 15.2 @ 91 before exhaust. Not bad for a 3800lb auto 4.6L
No Longer own: 91 LX 5.0L 5 spd
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