Exhaust Chat, do we get OPF/GPF error?

[Chappers]

Hey guys is anyone rocking a cat back exhaust? Do we need to get an OPF delete module? I've had a look and there doesn't seem to be any cables running from the OPF only from the Cat.

I'm looking at a Cat back exhaust but want to make sure I don't need to do anything else.

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[Sunstorm]

I have Milltek OPF back so I'm not 100% sure, but looking on their website, they sell a OPF bypass and that states "Required Stage 2 ECU Remap"

Someone who has done the OPF delete might have a clearer answer for you.

 

[Chappers]

Thanks, Yeah it's really unclear with our OPF supras whether we get the error or not, other bmws have the sensor attached to the OPF but I can't physically see a connection.

 

[Chappers]

I can see where it would connect, similar to the aftermarket delete module, but only the Cat has a connection and a blank slot next to it.

 

[Tri5tate]

Yeah you'll get a error code (P244A) if you remove the OPF. It doesnt show up straight away but eventually it will. Not sure if this was because I removed the OPF, but im pretty sure.

My tuner forgot to disable it in the beginning so after a couple of weeks I got the code, and then they disabled it.

 

[Chappers]

How does it know? interesting . I'm a 22 so can't tune, I guess the delete module is required

 

[SCZ4]

You need this if removing the OPF - https://www.garagewhifbitz.co.uk/product/garage-whifbitz-opf-gpf-delete-harness/

Some of the rear silencers\systems are OPF back rather than Cat back as they were back in the day.

 

[Tri5tate]

How does it know? interesting . I'm a 22 so can't tune, I guess the delete module is required

I really dont know. Also I dont know why the error code came long after But it was a error code related to the particulate filter.

 

[SCZ4]

How does it know? interesting . I'm a 22 so can't tune, I guess the delete module is required

Be interested to hear what you end you end up doing. I've already had the "OEM backbox mod" done, and whilst it definitely makes a difference, I'm still looking for some additional volume, whilst retaining the deep sound. The dilemma\options are:
1 - OPF Delete (probably going to make the biggest difference)
2 - Catted Downpipe (easily reversible)
3 - Replace rear silencer

Options 1 & 2 would invalidate my warranty, whilst option 3 probably wouldn't release enough sound.

 

[Tri5tate]

Be interested to hear what you end you end up doing. I've already had the "OEM backbox mod" done, and whilst it definitely makes a difference, I'm still looking for some additional volume, whilst retaining the deep sound. The dilemma\options are:
1 - OPF Delete (probably going to make the biggest difference)
2 - Catted Downpipe (easily reversible)
3 - Replace rear silencer

Options 1 & 2 would invalidate my warranty, whilst option 3 probably wouldn't release enough sound.

Get rid of that OPF. It makes the sound so much more pure, and the pops alot louder.

 

[SCZ4]

the pops alot louder.

That's my biggest fear, then need a remap to map them out.. Wouldn't want them any louder than they are at the moment.

 

[Chappers]

Be interested to hear what you end you end up doing. I've already had the "OEM backbox mod" done, and whilst it definitely makes a difference, I'm still looking for some additional volume, whilst retaining the deep sound. The dilemma\options are:
1 - OPF Delete (probably going to make the biggest difference)
2 - Catted Downpipe (easily reversible)
3 - Replace rear silencer

Options 1 & 2 would invalidate my warranty, whilst option 3 probably wouldn't release enough sound.

This is exactly the dilemma,

Whifbitz do a back box delete I.e. straight pipe. Which I imagine would give biggest sound with stock cat and OPF.

I'm still contemplating what to do lol...

 

[Chappers]

That's my biggest fear, then need a remap to map them out.. Wouldn't want them any louder than they are at the moment.

From what I've seen in videos the pops are more pronounced in sport mode and not so much in normal

 

[Chappers]

I agree I don't want it constantly popping and banging like AutoAlex's Lindsey MX5

 

[SCZ4]

This is exactly the dilemma,

Whifbitz do a back box delete I.e. straight pipe. Which I imagine would give biggest sound with stock cat and OPF.

I'm still contemplating what to do lol...

Shame they only supply that with the weird "blueflame" tip finish. Given the cost, I'd d be willing to give it a go if they could match the OEM brushed tips.

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