2.0 S MFI - Headers/Muffler require fuel adjustment?

[Brbrbr]

Hi all - relatively new to the MFI world, so apologies if this question has been discussed elsewhere. I'm considering changing out my SSI H/E's for a set of equal-length tubular headers and swapping the current Dansk sport muffler with something else. The motor is a 2.0 S with MFI pump (serial ending in 005) and runs great.

Will adding a freer-flowing exhaust create drivability issues or should I expect to have to retune the MFI pump?

Will eliminating the warm air flow to the MFI pump cause warm-up issues?

[2.5MFI]

Since your considering this and your engine runs great, in my opinion I would leave it as is with your SSI H/E's and sport muffler. Reason I say this is because I have run a few tests on a dyno over the years and found with a 2.0 MFI engine there is a loss of low end torque when using certain equal-length headers. And with the loss of your warm air thermostat you will have to fabricate a cold start system. Not a hard thing to fab but with these changes I don't really see a big leap in performance gain.

[Brbrbr]

Very helpful. It's already fairly anemic below 5k, so might be best to leave well enough alone.

[edmayo]

You might want to check for full throttle,,,,might be surprised!