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Message: <blockquote data-quote="vr2turbo" data-source="post: 1064587604" data-attributes="member: 92229">More to read....Why don't car companies fit them as standard?There are two main reasons, firstly like all things, vehicles are made to a standard and a cost. The cast iron standard manifold will always be the cheapest way of producing an exhaust manifold. However, car manufacturers do know the benefits of a tubular designed exhaust headers and indeed generally do offer this type of product on a sports related sedan, eg. HSV, Tickford/FPV, etc. These tubular manifolds are still better than a standard manifold but are still limited to cost, and as such are a compromise in design.Secondly, cast iron manifolds can be cast into awkward and different shapes to accommodate steering boxes, etc, and can be installed onto the engine along with all the other necessary bolt on components during engine assembly and with the engine still able to be slotted into the body during the vehicle build. Headers however will generally take on a different proportion and often can wind themselves around steering components, etc, which in turn would slow down the vehicle build time process.Cast iron exhaust are not tubular.....<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/smokin.gif"  class="smilie" loading="lazy" alt=":smokin:" title="Smokin    :smokin:" data-shortname=":smokin:" />---------- Post added at 12:10 PM ---------- 6 hour anti-bump limit - Previous post was at 12:09 PM ----------As far as I know extractor cannot be too long then no more back pressure......<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/smokin.gif"  class="smilie" loading="lazy" alt=":smokin:" title="Smokin    :smokin:" data-shortname=":smokin:" /></blockquote>

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