DP/FP Vs. full exhaust system swap?

[scano]

Looking for some pointers. I was wondering if I would benefit from installing a DP/FP to the current stock exhaust system on my 18 Civic SI or should I install the following exhaust system with DP/FP?

https://www.maperformance.com/colle...sp-exhaust-2017-honda-civic-si-sedan-10158217

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[hitch]

A DP/FP on it's own will make a power difference as long as you get a tune to suit, otherwise expect CEL.

A Full exhaust will allow additional (minimal) power gain as it's mostly noise from the cat back.

 

[Jes_si562]

Yes dp/fp would benefit on stock exhaust but would need ktuner like hitch said to disable the O2 slow response

 

[scano]

@hitch @Jes_si562 have you guys used the Hondata flashpro? Was reading online and it seems to have two calibrations a 6+psi and 9 psi. My civic is still in its stock stages so do you guys think that with the 6+ psi the CEL will be avoided?

Thanks in advance!

 

[Jes_si562]

@hitch @Jes_si562 have you guys used the Hondata flashpro? Was reading online and it seems to have two calibrations a 6+psi and 9 psi. My civic is still in its stock stages so do you guys think that with the 6+ psi the CEL will be avoided?

Thanks in advance!

Yes you'll have to disable the slow o2 response on flashpro or ktuner and if you like you can do the +6psi calibration on top of that

 

[scano]

Yes you'll have to disable the slow o2 response on flashpro or ktuner and if you like you can do the +6psi calibration on top of that

@Jes_si562
Any chance that disabling the o2 response will affect emissions?

 

[Jes_si562]

@Jes_si562
Any chance that disabling the o2 response will affect emissions?

As long as you get the catted dp it won't

 

[Micah]

be aware some aftermarket catted DP with "high flow cat" have been known to still result in O2 sensor codes.

Also while the stock catback is not a source of restriction from a flow viewpoint, it still does have weight to it. If you are able to replace with something much lighter in weight, it's going to benefit performance.

Search the forum for Hondata vs ktuner. Both are ok, one is generally loved much more. I own both. My Hondata has been sitting in the box so long that I'm probably going to sell it. It has the TSP Stg1 map attached to it, so I guess that's worth mentioning. Great map, but it runs better on ktuner than on Hondata at least from my personal experience.

 

[hitch]

@hitch @Jes_si562 have you guys used the Hondata flashpro? Was reading online and it seems to have two calibrations a 6+psi and 9 psi. My civic is still in its stock stages so do you guys think that with the 6+ psi the CEL will be avoided?

Thanks in advance!

My car has a custom tune map applied (I'm in Australia). Using Hondata and the Flashpro.

I'm not familiar with the built-in available calibrations, with only a DP/FP however I'd just apply a standard map that caters for that mod to avoid the CEL. I wouldn't go pushing more psi, you'll just generate more heat

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