From experience taking it off numerous Vipers, the flex pipe doesn't seem to be necessary, but that may depend on how many miles yo're driving your Viper a year.
Actually I don't have
any Winter projects planned to <u>do</u> on the car while it's cold.. though I am constantly planning more and more for next year it seems.
Next Summer, there are numerous experimental projects afoot in my effort to get into the 10's on a budget. - Without buying headers, a catback, 1.7 rockers, doing any internal engine work, or power adders.
Just some mods ahead of the OE TBs, and after the OE exhaust manifolds; slicks and my not-yet-installed SVS shifter. Leaving the OE post-resonator exhaust tubing OD size intact.
Stay tuned ! It's going to happen