![]() ![]() Single biggest issue with the exhaust is where the 2 pipes merge together. exhaust was restrictive on your 200hp cars and will choke the snot out of good modern power level engine. Once the intake is addressed on your project the next place to modify is the exhaust. Madmax on the website had a very nice post with picture showing that porting. Now if your really on a budget and have more time than money, you can modify the stock TPI intake base to shorten the effective intake runner length by cutting out a section of aluminum between the intake runners on that intake base and you will get at least 1/2 the gain if not 3/4 the gain of the aftermarket intake. If you don’t need it get rid of it but some just have to have it although I have had some customers epoxy one on before and made it look functional but not and get through the emissions test on a good engine build. Note that the Edelbrock and Weiand intakes do not have EGR provision for emissions and its an optional piece on the TPIS intake. also comes in a standard and vortec version as well. On a STRONG 383 engine though this intake is HARD to beat. Why they couldn’t have made the intake a inch shorter, I don’t know. BARELY fits under the Camaro hood and most Firebirds it won’t fit under and is a good inch too tall for under a Corvette hood. Intake is great performing intake and the reason its not number one is its too tall. Last intake on the recommend intakes list is the Holley Weiand stealth ram, 2 piece intake setup which does have some possibility for vacuum leak but 2 much better than 8. This intake also comes in a version for vortec heads which opens up another avenue of performance heads for you. intake is much more affordable than the TPIS intake but it requires a LS1 or LS2 single blade throttle body which I don’t necessarily think is a bad thing just adds to the expense. Another similar option is the Edelbrock pro flow xt which is the Ramjet intake GM uses on their Ramjet crate engine. ![]() A bit expensive really but nice one piece intake design that cures the issues with TPI intakes. Which is pretty much a LT1 intake designed for TPI. Best intake for TPI in my opinion is the TPIS miniram. heads flow practically identical numbers and the cam was almost as similar. The Key reason the the 88-92 L98 350 TPI motors made 245hp and the 93 LT1 made 275hp is that intake. EVERYONE needs to read so I might need to move the edelbrock up a notch to my most recommended intake setup for a TPI engine. If you want good horsepower numbers from your car that intake has to go. Changing runers can help some but still perpetuating that long runner torque only design. In a jeep or 4×4, great low end torque although still 8 places for vacuum leaks. with a base intake, a plenum and then 4 long runers giving 8 problematic places for vacuum leaks and those long runners just kill any top end power potential. ![]() Just reminds of another of GM’s screw-ups and poor design. Next is that intake manifold, for some reason people seem to like the looks of it. I recommend you get a block off kit off ebay and remove the thing and tell me when you order a chip so that I can program the chip to run with the other 8 injectors and that will solve a lot of cold start issues on these cars. The worst piece on the whole TPI system is the cold start injector or referred to as the 9th injector. ![]()
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