because a lot of people drive their car on the street and the smaller manifold spools the turbo faster. i would also think that there are not a lot of cars on here with a turbo big enough to truly benefit from a top mount.
A lot easier to bolt a ramhorn + small turbo in a DD/light build than have to cram a top mount in the same space.
On my three turbo builds I've done, I used a cheap stainless ramhorn on the first and then replaced it with a cast ramhorn and EWG, second was a cast ramhorn but IWG, third was HF mani with adapter. I definitely prefer the cast ramhorn over everything else I've tried. I can't say it was better than the stainless ramhorn I used, because the stainless one cracked before I really got to test it out, so really all of the full boost I've pulled has been on cast manifolds.
Cast manifolds are a little better about holding up to being thrashed too, while tubular ones will snap, break, bend etc. a LOT easier (Should be a "duh" point here, of course cast iron is stronger than thin steel).
If I'm going to drive a boosted single cam for more than a quarter mile at a time I'd rather have a cast ramhorn on there than anything else. Easier to maintain, easier to install, and if you ever replace it the dimensions on cast rams are pretty close across the range so modification is minimum.
Nothing to really complain about.
As far as making power, the manifold you use in a turbo setup is less important than pretty much everything else. You can make pretty similar power numbers on a cast ram and top mount/equal length manifolds anyways.
Some of us aren't all about numbers. Personally I couldn't care less about my peak numbers if I have a big juicy torque curve. It's just not worth it to get that extra little bit at the top of the rev range since you aren't going to spend all of your time up there anyway.
my top mount is waaaaay easier to deal with then any bottom mount ive ever had just for the record.
and OP its all about money most of the time. i found my topmount for cheaper then a ramhorn is new. plus i dont like the look of the ram horn manifolds.
and i wants good up top power since its on a mostly track car. power comes in late put makes peak power all the way up top so it pulls good till i need to shift. doesnt fall off in the top end.
A Lot of it is money man, flow is good but unless a full track car the benefit of a top mount over a RAM horn other than looks is not there. Me I personally use a forward facing manifold putting my turbo ruby inside the bumper and driver side frame rail.
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