I'm looking to possibly pick up a used Invidia Gemini exhaust. A used FI would be ideal, but even used ones are still pricey.

My concern with this exhaust is how far back the X-pipe merge is located. My arm-chair tuning research points a y-pipe merge being done closer to the cats than where the Invidia merge is located. Just looking at other exhaust options and they all have a y-/x-pipe merge sooner.

Too many people have invidia gemini in their signatures, so a search turns up too much spam to find dyno sheets.

So my main questions are: does the gemini merge location really have a big effect on horsepower gains? If so, has anybody modified theirs? similar to how people splice in a magnaflow x-pipe on the knock-off HKS exhausts...

 

I switched the resonator location on mine with a magnaflow x pipe. My resonators are now where the invidia x used to be.

I switched mine due to the same reason you posted merge location.

Pulls a little harder to me. I'll take pics tonight when I get my 3.7FD installed.

 

So you have the magnaflow AND the invidia resonators? I bet that's one quiet exhaust. Please do post pics!

 

Yes it is sleeper until you get on it, but still not loud. I was afraid it might drone without the resonators so I kept them.

I had MBS in Pasadena do it no piping was added to swap locations.

I'm happy with it along with the longtubes. The car still put down 289 on hills dyno.

 

I at first switched the invidia X, but it had rasp so i got the magnaflow. The magnaflow x had no rasp when installed.

The magnaflow is the same X that FI uses.

 

i have spare driver and pass. side down pipes that are brand new from invidia..the pipes are the ones that have the flex in them and the resonator...Brand new. just in case anyone needed for an exhaust project..

 

The closer an x pipe is to the combustion chambers, the more it will aid in scavenging.

 

@Dsskyline I'd love to see pics of that setup you were talking about (swapping the Magnaflow X with the resonators). I might be interested in something similar myself.