SeaFoam - Before or After Exhaust Install

[BuffaloXplorer]

I've read up and am going to try SeaFoam in my '96, 150,000 mi 4.0L. However, I'm having a Flowmaster Catback installed this weekend.

Which should i do first??? My current exhaust is full-o-holes and may not provide the correct backpressure (if necessary). Should i do the seafoam now, before i introduce the Flowmaster, or after i've gotten rid of my current setup? I'd rather not send all that **** through the brand new muffler & tailpipe...Let me know!

Thanks Guys

 

[performancenut]

I would do it prior. Seafoam apparently removes carbon and contaminants through digestion and degredation via it's solvent and chemical capabilities. Back pressure issues should not be a real factor with either vacuum/intake method nor fuel system (gas tank) method. Also doing it prior to the exhaust mod. sets a good baseline for comparison.