Need some help, please :D

[dollah]

This is the only picture i have of my undercarriage. I just bought the stinger maybe 3-4 months ago. The exhaust is kinda loud but i don't know what the previous owner did to make it loud and still have stock exhaust on it.
There's also intakes, i added a FMIC, and snorkels. What else can i do to add HP? I don't want a tune yet, but i want to make sure i'm able to keep up with scat packs (surprisingly i already do and i beat some lol) c43s,m340is etc..
Im not too familiar with pipes and stuff, im trying to be.
Would getting the HFC downpipe+midpipe combo do me any justice? Im running on 93 octane , not sure if thats needed or not.
But once i get the down+mid pipes, ill have that, intakes, fmic, snorkels, what else can i do without adding a tune?

 

[Ohiocruiser]

That's a borla exhaust and aftermarket catless secondaries you have there. And if you are beating m340i, you are tuned.

 

[dollah]

That's a borla exhaust and aftermarket catless secondaries you have there. And if you are beating m340i, you are tuned.

I'm not sure if its borla, the exhaust itself is stock. But the secondary catless might be the thing he did..hmm

 

[Snowwhite]

post a better photo of the muffler cans and we can tell what they are.

 

[dollah]

post a better photo of the muffler cans and we can tell what they are.

the mufflers are stock lol. nothing done to mufflers

 

[dollah]

post a better photo of the muffler cans and we can tell what they are.

I took a look and its catless. it also looks like he did an x-pipe? im not sure, whatever is usually connecting under the cats also has been changed cuz it doesn't look factory.

 

[Thomby]

What's the textured stuff on the underside of the battery well, between the mufflers?

 

[dollah]

What's the textured stuff on the underside of the battery well, between the mufflers?

No clue honestly