SEPST or DJPV?

[Xyzzy]

I have a 2018 Softail with the M8 engine.

My bike is completely stock except for slip-on mufflers. (I haven't put them on yet.)

The catalytic converter is in the mufflers so when I put the slip-ons on there will no longer be a catalytic converter on the bike.

The intake is stock. As mentioned, the only mod is the slip-ons.

QUESTION:

Do I buy a SEPST or a DJPV tuner?

SEPST:

+ I keep the warranty. (I can put the stock mufflers back on if I need warranty work.)
- Limited tuning potential. (Enough for just slip-ons?)

DJPV:

+ Unlimited tuning potential.
- I lose my warranty.

FWIW, I don't need more power. I just want smooth fuelling and and a bike that doesn't sound like an angry sewing machine.

PS - The slip-ons:

https://cobrausa-vtwin.com/softailsreg/flsl_softail_slim_18_18/motorcycle_exhausts/slip_ons/3_inch_rpt_slip_on_mufflers/6057/

[Hossamania]

Do you want to keep the warranty?
Answer that, you answer your question.
I would think for just a muffler change, the SE tuner will do just fine.

[Xyzzy]

"Will the SEPST will be able to tune that combo?" is the question I'm asking myself.

I've never needed a warranty on a Harley but it sure is nice knowing that I have one in case something bad happens.

[Hossamania]

If the SE tuner can't handle a simple muffler change, there is no reason for it to exist.
Having said that, I can't categorically say that it will, but it sure should.
I'm sure someone will chime in shortly with much more knowledge than I.
If the warranty is not a deal killer, I would go Power Vision all the way. Not even a choice at that point.

[1FSTRK]

Maybe this will help you........ or maybe just confuse things more?
http://harleytechtalk.com/htt/index.php?topic=100984.msg1185116#msg1185116

I would go PV myself but I would never stop with just slip-ons

[Xyzzy]

Very interesting!

I wonder what would happen if I used the SEPST "Stage 2" flash on my "Stage 0.5" build?

I have a PV so it will cost me $300 if I buy the SEPST but only $200 for a license for the PV.

FWIW, I have no interest in adding other parts. Just the slip-ons.

[PoorUB]

Pretty sure just adding non-EPA mufflers will void the warranty anyway. My understanding is to maintain warranty any mods need to be EPA approved.

I missed the part about putting the mufflers back on. What happens if you are 500 miles from home when it dies?

[rigidthumper]

If I were worried about having possible warranty issues, I would have the SE mufflers, SE Air cleaner and SE tuner done at a dealer. Don't give em any ammunition...

[Hossamania]

If I were worried about having possible warranty issues, I would have the SE mufflers, SE Air cleaner and SE tuner done at a dealer. Don't give em any ammunition...

That.

[PoorUB]

IMO, you void the warranty yourself, or run approved mods.

[Xyzzy]

A mature and responsible person would put on the "approved" parts with the "approved" tune.

Since I'm neither mature or responsible I bought a new license for my PV today.

[Xyzzy]

A follow-up:

I put the slip-ons on today and flashed the ECM with the tune Jamie sent me. I rode a quick 300 miles to see if anything weird would pop up but everything works great! If I can figure out how to do the auto-tune deal I will do that. Right now my focus is on trying to calibrate my speedometer/odometer to my GPS unit. My bike runs 3% fast.

[Xyzzy]

Right now my focus is on trying to calibrate my speedometer/odometer to my GPS unit. My bike runs 3% fast.

It ended up that my bike was 5.3% fast. I adjusted the pulses/km setting and now, over a 100 mile stretch, compared to my GPS, the bike is within 0.1 miles, or 0.1%.

This is the GPS I use to calibrate speedometers. It is a lot of fun to play with since it is so small. I've put it on remote control cars, dogs and all sorts or weird things!

https://buy.garmin.com/en-US/US/p/508487

(I got it on sale for $100)