I am looking into upgrading my existing G35 exhaust. I have decided to go with Stillen. From the threads I have read aftermarket headers & HF Cats are not worth it when considering money spent and longevity. So now I have decided to possibly upgrade the Y-pipe depending on YOUR feedback!!!! Question, The Y-Pip is the piping that leads from the Headers to the CATS correct? If so, What are the possible gains for adding an aftermarket Y-pip?, What are the differences in OEM-Y VS Aftermarket-Y?, What are good brands out & does Stillen make a Y-pipe? Thank You!!

 

The Y pipe is after the cats and leads to the mid pipe

 

people here say that y pipes do little for performance, and some even make you lose power. with that said, stillen also makes a y pipe as well but if you're going stillen catback, you're not going to need it since it's a true dual. if i were you, i'd just get the stillen catback with hfc

 

Something to consider, if you haven't - is the Fast Intentions catback and HFC's. The combination puts out 20HP and 18TQ - and some have even dyno'd higher.

Unless you go with a 3" single, or a 2 1/2" dual - y-pipes and such will yield you pennies for HP. The FI HFC's, on a stock car with stock exhaust, made about 10HP and 9 TQ. So HFC's are NOT a bad investment, when most catbacks produce the same result.

Let me know if you have any questions. I don't want to seem like I am only selling you on FI products, vs. the technology.

Rick

 

So, once i install the Stillen duel CAT back exhaust the only parts left that may cause restriction are the headers and CATS?. Is this correct.

 

Yep..there's nothing left at that point in the system.

Rick

 

i've posted this once already, be careful with the stillen exhaust when combined with headers AND test pipes OR race cats, after investing some $$ in both I went back to stock cats because the stillen system picks up a serious rasp from 3500rpm to about 5500rpm when running headers/free flow cat system. I loved the power that I felt with the "no restriction" system, but couldn't stand that honda sound . . . fyi

 

a y pipe exhuast will give you more TQ gains and HP due to the back pressure created with the bottle necking. ill take TQ over HP but to each their own

 

So..bottlenecks are better for performance, huh?? Better than a tuned system designed to give you HP and TQ??? I guess you can't beat the stock exhaust then....

 

Thanks Rick. You have been allot of help. I may purchase the Stillen exhaust soon. What are your impressions of this system?. I love the sound of the Stillen & would even consider other brands if the tone is the same. If I can get the same tone, but louder I would be happy.

 

Check MYNISMO.COM, everythingg35.com, maybe bulletproof? guys??

 

Were you using the Gen1 Stillen on your car?? I know for the sedans Stillen has a Gen2 which is quieter, but not sure about the coupe.

 

You NEED to hear the Fast Intentions and HKS...that's all I can say. HKS is going to be pretty loud...

Rick