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Old 06-10-2014, 01:18 PM
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nishfish871
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LTH on Sedan
First of all, has anyone gone down the LTH route for a sedan? I am looking to buy a full FI exhaust setup. FI are in the unknown if it would fit the sedan. The infiniti part #'s for stock manifolds and cat conv is the same in the coupe and sedan.

Does anyone have any insight into why it won't fit?
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Old 06-10-2014, 01:31 PM
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GoFightNguyen
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Originally Posted by nishfish871
First of all, has anyone gone down the LTH route for a sedan? I am looking to buy a full FI exhaust setup. FI are in the unknown if it would fit the sedan. The infiniti part #'s for stock manifolds and cat conv is the same in the coupe and sedan. Does anyone have any insight into why it won't fit?
The coupe HFC's are 2.50" ID, and Sedan HFC's are 2.25" ID. I can only assume this is because the sedan exhaust from FI is also 2.25", while the coupes is 2.5". I'm guessing that the LTH's are also 2.5", meaning you'd be taking an ID reduction from headers to catback.
Last edited by GoFightNguyen; 06-10-2014 at 05:10 PM.
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Old 06-10-2014, 01:36 PM
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Originally Posted by GoFightNguyen
The coupe HFC's are 2.50" ID, and Sedan HFC's are 2.25" ID. I can only assume this is because the sedan exhaust from FI is also 2.25", while the sedans is 2.5". I'm guessing that the LTH's are also 2.5", meaning you'd be taking an ID reduction from headers to catback.
FI makes a 2.5" at the cat and catback for an extra $100.
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Old 06-10-2014, 04:25 PM
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twin_snails
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Originally Posted by nishfish871
FI makes a 2.5" at the cat and catback for an extra $100.
+1 on this. I've got a full 2.5" RHFC and non-resonated CBE setup on order for my sedan. Hopefully it'll be here soon. I've been chomping at the bit to get this thing installed. It should sound pretty nice. It's going to be loud but I don't mind that.
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Old 06-10-2014, 10:27 PM
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Originally Posted by twin_snails
+1 on this. I've got a full 2.5" RHFC and non-resonated CBE setup on order for my sedan. Hopefully it'll be here soon. I've been chomping at the bit to get this thing installed. It should sound pretty nice. It's going to be loud but I don't mind that.
Looking forward to hearing a sound clip of that. Not to thread drift but I was looking at their TT set up today...very tempting
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Old 06-11-2014, 09:19 AM
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Originally Posted by GoFightNguyen
The coupe HFC's are 2.50" ID, and Sedan HFC's are 2.25" ID. I can only assume this is because the sedan exhaust from FI is also 2.25", while the coupes is 2.5". I'm guessing that the LTH's are also 2.5", meaning you'd be taking an ID reduction from headers to catback.
are you sure? i know you can use sedan and coupe cats interchangably, even 370z cats, and Y pipes for that matter. that doesnt mean they are the same diameter, but i was pretty sure they were all 2.5" for aftermarket
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Old 06-11-2014, 09:47 AM
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Originally Posted by 08Gsmith25
are you sure? i know you can use sedan and coupe cats interchangably, even 370z cats, and Y pipes for that matter. that doesnt mean they are the same diameter, but i was pretty sure they were all 2.5" for aftermarket
I got an email directly from Tony at Fast intentions telling me about the ID difference
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Old 06-11-2014, 10:15 AM
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Originally Posted by GoFightNguyen
I got an email directly from Tony at Fast intentions telling me about the ID difference
I think it's the route FI chose to take on the sedans since they assumed majority aren't interested in max performance.
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Old 06-11-2014, 10:25 AM
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Originally Posted by nishfish871
I think it's the route FI chose to take on the sedans since they assumed majority aren't interested in max performance.

yeah im 95% sure my sedan HFCs are 2.5"

possibly bought them from a coupe owner though
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Old 06-11-2014, 03:49 PM
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I don't see the point of replacing any exhaust component with anything aftermarket that is 2.25"
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Old 06-11-2014, 04:17 PM
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Originally Posted by botlfed98
I don't see the point of replacing any exhaust component with anything aftermarket that is 2.25"
If you're only going to replace part of an exhaust system, you don't want to be staggering internal diameter's too much. Every time you change up the ID of a fluid pathway, you change the velocity and create turbulence.
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