- Location
- Dallas, TX
- Car
- 2007 FX35 RWD
I know of an Infiniti dealership that installed a Stillen s/c, so not all are like that.
There isn't. Infiniti dealers are scared when I bring my car in. And it only has coilovers, exhaust, and some electronics. I literally had one try to deny warranty becuase I had factory DVD headrests. He was SURE they were aftermarket and even made me turn them on and show them the Infiniti logo. Morons. They would NEVER sell something performance oriented like forced induction, like Toyota or Honda will, unfortunately. They just dont have the market.
I know of an Infiniti dealership that installed a Stillen s/c, so not all are like that.
... They would NEVER sell something performance oriented like forced induction, like Toyota or Honda will, unfortunately. They just don't have the market.
I've read that before, but even that thread confirms that a cast log is indeed an inefficiency even under 500hp. it affects throttle response and spool time across the board. from that very thread, right on the first page:
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"a cast manifold is "typically" more durable, however, the cast manifolds simply cannot outflow a tubular manifold. also the cost of cast is far more affordable.
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I had a PHR Stg1 on a modified Turbonetics cast manifold and thought it was perfect for what I wanted...fast spool, durable setup capable of 470whp at 17 psi on pump and a tad over 600whp on racegas at high boost. As far as why the majority uses tubular, a lot of people here are making power levels that exceed what the logs are good at.
I made 816rwhp with Arnout's manifold and a PT70GTS. HKS 264 cams, everything else on the motor is stock down to the intake manifold and throttle body.
Everybody always wants to claim the cast manifolds are just the cheap way to do things and that they suck for power, but I feel that if you have the other necessary mods the power can be very similar to a tubular header.
Cast is cheaper typically, more reliable, usually provide at least couple hundred rpm worth of honest spool improvement better fitment in a lot of cases as well.
Con cast:
never equal flow, nor equal resonance tuning. Flow is more restrictive, doesn't sound as nice usually (preference obvz)
Tubular would be the opposite of the cast.
i have to search for it but mr corky bell himself once said that log manifolds are king but an equal length tubular header provides better response.
my cast manifold, it fits great and performs very well....My 67 spooled faster than other friends with 61mm turbochargers, on virtually the same setup as me minus the manifold.
i also want to add that while certain log designs MIGHT produce a slightly quicker spool on certain setups, that of 300 rpm or so is certainly not worth the loss of efficiency at higher rpms
I was just asking if anybody can show a real example of a tubular outspooling a cast setup at the power levels I mentioned...I've never seen that happen.
theory is nice but its the real world that counts ;-). Never seen a tubular mani. spool faster than a log mani.

... Sorry, I'm an engineer. If you want to talk about feelings and make friends the real world is right out that front door ----------->![]()