[twang2931]

I cant find any catless invidias but im looking to pick up used tomei catless downpipe.
Will this fit for a with a invidia r400?

And would i need to buy adaptors or any other things that i should know?

 

[Karlot]

You should know on cobb. You can’t tune for this. And even on an opensource/standalone, tuners likely won’t want to take on a liability risk to tune for a catless setup. Make sure you have that covered before buying a catless downpipe.

 

[twang2931]

You should know on cobb. You can’t tune for this. And even on an opensource/standalone, tuners likely won’t want to take on a reliability risk to tune for a catless setup. Make sure you have that covered before buying a catless downpipe.

yeah i know its not available as a OTS from cobb but my tuner said he can still tune it, the only thing is that he can’t guarantee the check engine light won’t be an issue

but did you mean that in general there is a technical block on the new accessport new version that detects and blocks catless dp?

 

[Karlot]

yeah i know its not available as a OTS from cobb but my tuner said he can still tune it, the only thing is that he can’t guarantee the check engine light won’t be an issue

but did you mean that in general there is a technical block on the new accessport new version that detects and blocks catless dp?

i meant protunes. typically with check engine lights, the car will pull timing/boost making it slower. maybe tuners have a way around that so the cel is there but the rest of the car doesnt care that it's there. either way, i personally would go nuts with that. i'd save a bit more for a cobb gesi cat that can be protuned. the gesi cats really dont rob power like the cats of 8-10 years ago. you MIGHT drop like 5 horsepower. small enough that you wouldnt notice.

if you go opensource, or with a standalone if you are super baller, you can have no cel provided the tuner is willing.

and idk about the new accessport version and if there's a technical block, i doubt it but i wouldnt be surprised if there was a way to do it.

 

[twang2931]

i meant protunes. typically with check engine lights, the car will pull timing/boost making it slower. maybe tuners have a way around that so the cel is there but the rest of the car doesnt care that it's there. either way, i personally would go nuts with that. i'd save a bit more for a cobb gesi cat that can be protuned. the gesi cats really dont rob power like the cats of 8-10 years ago. you MIGHT drop like 5 horsepower. small enough that you wouldnt notice.

if you go opensource, or with a standalone if you are super baller, you can have no cel provided the tuner is willing.

and idk about the new accessport version and if there's a technical block, i doubt it but i wouldnt be surprised if there was a way to do it.

wait just so im understanding correctly, the catless dp will result in slower performance in the timing/boost?

But my tuner said he can still protune it, the only thjng is the cel will be in my face but everything should be running fine

 

[Karlot]

wait just so im understanding correctly, the catless dp will result in slower performance in the timing/boost?

But my tuner said he can still protune it, the only thjng is the cel will be in my face but everything should be running fine

so typically, when a car throws a check engine light, the ecu will pull timing/boost to protect the motor. i'd imagine with the protune even when the cel showed up, it could still pull power/boost because the ecu thinks something is wrong. it is possible i'm wrong on this, and a tuner would know better than I. but i'd assume that the CEL could possibly cause that issue if it's tuned through cobb. and for that reason i'd worry. you could always try, and if it does do that, swap to a gesi cat or have one welded in, and have the tuner adjust the tune, which likely wouldnt cost as much as a full protune. and then be good to go.

but like i said, the gesi cats are really high quality and not like cats of yester-year. they will still leave a little power on the table vs a catless setup, but not enough to notice, and definitely not enough to worry about if you arent super competitive in a racing setting, which 99.999% of people are not at that level anyway. so if you had the cash, getting a cobb dp with the gesi cat would likely be less headache and something you wouldnt even notice the difference on without getting a back to back dyno on the same day.

 

[twang2931]

so typically, when a car throws a check engine light, the ecu will pull timing/boost to protect the motor. i'd imagine with the protune even when the cel showed up, it could still pull power/boost because the ecu thinks something is wrong. it is possible i'm wrong on this, and a tuner would know better than I. but i'd assume that the CEL could possibly cause that issue if it's tuned through cobb. and for that reason i'd worry. you could always try, and if it does do that, swap to a gesi cat or have one welded in, and have the tuner adjust the tune, which likely wouldnt cost as much as a full protune. and then be good to go.

but like i said, the gesi cats are really high quality and not like cats of yester-year. they will still leave a little power on the table vs a catless setup, but not enough to notice, and definitely not enough to worry about if you arent super competitive in a racing setting, which 99.999% of people are not at that level anyway. so if you had the cash, getting a cobb dp with the gesi cat would likely be less headache and something you wouldnt even notice the difference on without getting a back to back dyno on the same day.

Ah i see, i understand now. Thank you for the clear explanation. Interesting I didn’t know CEL could result in the car automatically doing safety measure like that.

I’ll definitely look into the cobb gesi dp now. Also with the cobb gesi dp, i would have the option to just run the stage 2 OTS map from cobb right?

Total Mods looking at if with cobb gesi dp:
Sf intake
Ap
R400
Cobb gesi downpipe
Ots stage 2 map?

 

[Karlot]

Ah i see, i understand now. Thank you for the clear explanation. Interesting I didn’t know CEL could result in the car automatically doing safety measure like that.

I’ll definitely look into the cobb gesi dp now. Also with the cobb gesi dp, i would have the option to just run the stage 2 OTS map from cobb right?

Total Mods looking at if with cobb gesi dp:
Sf intake
Ap
R400
Cobb gesi downpipe
Ots stage 2 map?

since the greenspeed update, i dont think so. IF you can find an old stage 2 map maybe, but more than likely you'll still need a protune, as the greenspeed stage 2 doesnt include a downpipe anymore....at least i dont think it does.

 

[twang2931]

since the greenspeed update, i dont think so. IF you can find an old stage 2 map maybe, but more than likely you'll still need a protune, as the greenspeed stage 2 doesnt include a downpipe anymore....at least i dont think it does.

Ah i see. So it i got the cobb gesi catted dp, i’ll still need the protune, but will the CEL still come on?

 

[Karlot]

cel shouldnt come on with a protune. there's something dealing with the 02 that the tuner would need to do to prevent it. many have referred to it as "scaling" but tuners have told me that's not exactly accurate. @yamahaSHO is a tuner on here and may be able to explain it better than i could.

but the short of it, with the gesi cat you should be able to have a protune with no cel

 

[ocpokesmot]

You can get a catless tune and get a cel fix (o2 sensor spacer) on ebay to take care of the light.

 

[Karlot]

You can get a catless tune and get a cel fix (o2 sensor spacer) on ebay to take care of the light.

That hasn’t been working for most.
On top of that list tuners won’t do that because of the liability attached to it.

 

[ocpokesmot]

That hasn’t been working for most.
On top of that list tuners won’t do that because of the liability attached to it.

I’m not sure if it works for everyone but it has worked for me.

 

[twang2931]

I’m not sure if it works for everyone but it has worked for me.

Which catless dp do you have ?

Also how is the difference in sound between a tomei catless dp vs a cobb gesi dp?

 

[twang2931]

And also do you guys think it is necessary to add more reliability mods like aos and bov? I don’t want to spend more money and make it more complicated.

If i add more reliability mods like aos, will it make a difference for the tuner to get more juice and power out of his protune?

 

[ocpokesmot]

I have a Helix bellmouth downpipe that I have had on my car for a while. As far as sound between catted and catless I can't answer that question.

 

[Karlot]

And also do you guys think it is necessary to add more reliability mods like aos and bov? I don’t want to spend more money and make it more complicated.

If i add more reliability mods like aos, will it make a difference for the tuner to get more juice and power out of his protune?

A bov isn’t necessary at all, nor is it a reliability mod. The aos I say yes you should. Same with the killer b oil pickup and baffle. And the get a dom cylinder 4 cooling mod.

NONE of the above will add power or get you more from a tune. They will just increase reliability on a modified car.