Exhaust/Fabrication question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sr vegas 240 · 12-24-2020, 06:13 PM

So im building an exhaust on my s13 turbo ls and I got a flex pipe that I want to put in it. The issue is it will absolutely not fit anywhere on the downpipe. My question is if I put it in the axle back like right after the trans will it even do anything? Any fabricators/engineers that might be able to answer this?

Thanks in advance.

tuzzio · 12-25-2020, 06:23 AM

Typically the flex pipe helps keep the manifold or downpipe from cracking, however, some people don't use them if the exhaust is mounted rigid enough.

jr_ss · 12-25-2020, 01:00 PM

Ideally, you have the flex mounted in the DP. However, there are plenty of aftermarket pieces that do not utilize flex sections. Omit it for now and see if it is necessary before trying to make it work. Also, they have flex pieces that have pretty short Lang lengths for tight areas.

sr vegas 240 · 12-25-2020, 04:05 PM

I have a flex in the crossover pipe and I will put this one in the axle back even if it helps a bit. Mine is kind of bulky its 4"x6". I see the vibrant slim on but still its 3"od but id goes down to 2.72"

12-24-2020, 06:13 PM	#1
sr vegas 240 Zilvia Junkie Join Date: Dec 2013 Location: vegas Age: 33 Posts: 301 Trader Rating: (12) Feedback Score: 12 reviews	Exhaust/Fabrication question So im building an exhaust on my s13 turbo ls and I got a flex pipe that I want to put in it. The issue is it will absolutely not fit anywhere on the downpipe. My question is if I put it in the axle back like right after the trans will it even do anything? Any fabricators/engineers that might be able to answer this? Thanks in advance.

12-25-2020, 01:00 PM	#3
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,052 Trader Rating: (34) Feedback Score: 34 reviews	Ideally, you have the flex mounted in the DP. However, there are plenty of aftermarket pieces that do not utilize flex sections. Omit it for now and see if it is necessary before trying to make it work. Also, they have flex pieces that have pretty short Lang lengths for tight areas. __________________ My SR20VET

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12-25-2020, 06:23 AM	#2
tuzzio Nissanaholic! Join Date: Oct 2013 Location: Western Mass. Posts: 2,254 Trader Rating: (3) Feedback Score: 3 reviews	Typically the flex pipe helps keep the manifold or downpipe from cracking, however, some people don't use them if the exhaust is mounted rigid enough.

12-25-2020, 04:05 PM	#4
sr vegas 240 Zilvia Junkie Join Date: Dec 2013 Location: vegas Age: 33 Posts: 301 Trader Rating: (12) Feedback Score: 12 reviews	I have a flex in the crossover pipe and I will put this one in the axle back even if it helps a bit. Mine is kind of bulky its 4"x6". I see the vibrant slim on but still its 3"od but id goes down to 2.72"