Fe1 best downpipe

[j3llyfe1]

What is the best catless downpipe for my 11th gen si?. Do i have to tune after

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[marcusm86]

i dont know what your options are, but for catless you are just looking for a company where you can trust the welds and the metal - theres not much to it. You dont "need" a tune but you will (probably) get a CEL and you probably wont gain anything except smell without one.

 

[axion_industries]

We have a downpipe we actually make in the USA and its nothing like the competition

Catted and catless in one downpipe. We only have silver cerakote in stock

https://axionperformanceparts.com/p...1-downpipe?_pos=4&_psq=AXION+2N1&_ss=e&_v=1.0

 

[ModJPB]

The following are in order from highest to lowest HP gain.

Any catless - 100% need a tune to ignore p0420 error and will be stinky (sulfur/ rotten egg smell.) loudest.

27Won Catted - needs tune, slightly stinky exhaust note slight change.

PLM - cheapest, need a tune, gamble on fit/finish and durabilityand results.

MAPerformance Catted - does NOT need tune if with a defouler. Quiet. Upper shield install good, Lower heat shield doesn't not mount securely.

TSP/RV6 Catted - highest chance of not needing a tune or a defouler, least stinky, quietest but also not much of a performance boost.

*A tune is not for performance but to disable the secondary O2 sensor that can trigger a P0420 error because the gas flows to quickly and O2 changes to quickly that it thinks the catalyst is failing.

 

[axion_industries]

The following are in order from highest to lowest HP gain.

Any catless - 100% need a tune to ignore p0420 error and will be stinky (sulfur/ rotten egg smell.) loudest.

27Won Catted - needs tune, slightly stinky exhaust note slight change.

PLM - cheapest, need a tune, gamble on fit/finish and durabilityand results.

MAPerformance Catted - does NOT need tune if with a defouler. Quiet. Upper shield install good, Lower heat shield doesn't not mount securely.

TSP/RV6 Catted - highest chance of not needing a tune or a defouler, least stinky, quietest but also not much of a performance boost.

*A tune is not for performance but to disable the secondary O2 sensor that can trigger a P0420 error because the gas flows to quickly and O2 changes to quickly that it thinks the catalyst is failing.

Ours will make the most HP gains, really should look into the design we did unlike anything on the market.

And its 100% USA made

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